_______ appear, they are really much larger than the Earth. A. Small as the stars B. The stars as small C. As the small stars D. Despite of the small stars

DM

Dương Minh

23 tháng 10 2019

_______ appear, they are really much larger than the Earth.

A. Small as the stars

B. The stars as small

C. As the small stars

D. Despite of the small stars

#Mẫu giáo

1

NH

Nguyen Hoang Hai

23 tháng 10 2019

Đáp án A.

Cấu trúc nhượng bộ: Adj/ adv + as/ though + S + verb: mặc dù …

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QA

Quỳnh Anh Tong

26 tháng 6 2019

think he will get ________ the shock in such a short period of time. A. off B. out C. over D. away 93. You __________ give me a lift. I can easily catch a bus. A. don’t have B. needn’t C. don’t need D. mustn’t 94. Martin tried on three jackets, ___________ fitted him. A. none B. none of which C none of them D. not 95. I have English classes ________ day ; on Mondays, Wednesdays and Fridays. A. all other B. each other C. every other D. any other 96. _______________ caused certain diseases such...

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#Tiếng anh lớp 9

2

MH

Mai Hà Trang

26 tháng 6 2019

93. You __________ give me a lift. I can easily catch a bus.

A. don’t have B. needn’t C. don’t need D. mustn’t

94. Martin tried on three jackets, ___________ fitted him.

A. none B. none of which C none of them D. not

95. I have English classes ________ day ; on Mondays, Wednesdays and Fridays.

A. all other B. each other C. every other D. any other

96. _______________ caused certain diseases such as malaria was not known until the early 20 th century.

A. That mosquitoes B. Mosquitoes C. Since mosquitoes D. Mosquitoes which

97. It’s essential that every student __________ the exam before attending the course.

A. pass B. passes C. would pass D. passed

98. - Did your brother go to France ? - No, our parents suggested that we_____________ there at night.

A. won’t go B. don’ t go C. not go D. not to go

99. _____________________ appear, they are really much larger than the Earth.

A. As the small stars B. The stars as small C. Despite of the small stars D. Small as the stars

100. I haven’t seen Peter for a long time. I will _________ him this weekend.

A. call for B. call in C. call off D. call on

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H

Hoaa

26 tháng 6 2019

think he will get ________ the shock in such a short period of time. A. off B. out C. over D. away

93. You __________ give me a lift. I can easily catch a bus. A. don’t have B. needn’t C. don’t need D. mustn’t

94. Martin tried on three jackets, ___________ fitted him. A. none B. none of which C none of them D. not

95. I have English classes ________ day ; on Mondays, Wednesdays and Fridays. A. all other B. each other C. every other D. any other

96. _______________ caused certain diseases such as malaria was not known until the early 20 th century. A. That mosquitoes B. Mosquitoes C. Since mosquitoes D. Mosquitoes which

97. It’s essential that every student __________ the exam before attending the course. A. pass B. passes C. would pass D. passed

98. - Did your brother go to France ? - No, our parents suggested that we_____________ there at night. A. won’t go B. don’ t go C. not go D. not to go

99. _____________________ appear, they are really much larger than the Earth. A. As the small stars B. The stars as small C. Despite of the small stars D. Small as the stars

100. I haven’t seen Peter for a long time. I will _________ him this weekend. A. call for B. call in C. call off D. call on

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HA

hạ anh

14 tháng 5 2021

SETI: The Dream of Life in Space People have always gazed up at the stars in wonder. Their imaginations are filled with possibility as they think carefully how large the universe is and whether or not we are alone in it. Of all the stars out there, are there intelligent beings on a planet circling one of the stars looking back at us and wondering the same thing? It is difficult to comprehend how many stars there are, or even to guess the possibilities of their being intelligent life....

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SETI: The Dream of Life in Space

      People have always gazed up at the stars in wonder. Their imaginations are filled with possibility as they think carefully how large the universe is and whether or not we are alone in it. Of all the stars out there, are there intelligent beings on a planet circling one of the stars looking back at us and wondering the same thing?
      It is difficult to comprehend how many stars there are, or even to guess the possibilities of their being intelligent life. Yet our interest in finding out is so strong that the search has been going on for over a century. What we consider the modem Search for Extraterrestrial Intelligence (SETI) began around 1960.
      The SETI project not what many people think it is. A simple explanation is that scientists study electromagnetic waves that are being emitted throughout the universe. When they are looking at these waves, they have a good idea of what are considered natural, random patterns the waves take. Therefore, they are searching for anything that does not appear to be randomly. If they were able to find something non-random, they would believe that an intelligent sources of some kind must be creating it. Inother words, intelligent life would have to exist somewhere else in the universe.
      While the SETI project will continue lo listen for signals from an intelligent sources, other progammes hope to find any source of life. The Mars rovers will continue to search for dry lake beds and other areas on the Red Planet that may have once held life. If any lifecan be found outside the earth, then we are probably on our way to finding life that could be similar to our own.
36. How long has the search for life in outer space been going on?
      A. For a few years                                                B. Not over two decades
      C. Since 1960                                                       D. More than a hundred years
37. What are the people in the SETIproject listening for?
      A. Random waves                                                B.Specific voice in the universe
      C. Patterns that are not random                            D. Special time signals
38. Which of the following sentences is NOT true?
      A. People have long wondered if we are alone in the universe.
      B. Scientists searching for any form or life that is found elsewhere than the earth.
      C.Signals from intelligent sources will most likely be random.
      D. The roverson Mars are looking for signs of life.
39. When did the modernsearch for intelligent life begin?
      A. It began around 1960.
      B. It has been going on since the beginning of time.
      C.There is no record of when it began.
      D. It has not actually begun yet.
40. Why are people searching for intelligent life in space?
      A. Because they want to meet aliens.
      B. Because they have a strong interest in it.
      C. Because it is the reason for people's existence.
      D. Because life must exist somewhere else.

#Tiếng anh lớp 9

1

K

Komorebi

14 tháng 5 2021

36D 37B 38C 39A 40D

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LQ

Lê Quỳnh Anh

23 tháng 1 2017

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen. Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in...

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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.

Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmic rays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn’t seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.

Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significant greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.

However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperature were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased.

The creation of helium within stars ______

A. produces hydrogen as a by-product

B. causes helium to be much more abundant in old stars than in young st

C. produces energy

D. cannot be measured

#Mẫu giáo

1

DH

Dương Hoàn Anh

23 tháng 1 2017

Kiến thức: Đọc hiểu

Giải thích:

Việc tạo ra helium trong các ngôi sao ______

A. sản xuất hydro dưới dạng sản phẩm phụ B. làm cho helium có nhiều ở các ngôi sao tồn tại đã lâu hơn nhiều so với sao mới được hình thành

C. tạo ra năng lượng D. không thể đo được

Thông tin: Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce.

Tạm dịch: Helium được tạo ra trong các ngôi sao. Trong thực tế, phản ứng hạt nhân mà chuyển đổi Hydro thành Heli đảm nhiệm hầu hết năng lượng mà các ngôi sao tạo ra.

Chọn C

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AN

An Nhiên

21 tháng 8 2020

Read the text below and choose the correct word or phrase (A, B, C or D) for each space. Write your answer on the answer sheet. (2.5 points) PLANET EARTH Planet earth is part of a system of planets and their moons, as well as numerous asteroids and comets which (1) _____ around a huge star, the Sun. The Sun itself (2) _____ of gas. Nuclear reactions inside its core (3) _____ the heat and light that make life on the Earth (4) _____ . The Earth is the third of four small terrestrial (Earth...

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#Tiếng anh lớp 9

0

LQ

Lê Quỳnh Anh

26 tháng 4 2018

Read the followingpassage and mark the letter A, B, C or D onyour answer sheet to indicate the correct answer to each of the questionsStellar AstronomyMany parameters are used to describe a star. One of them is its temperature, which can be determined by simple observation; the color of a star and its temperature are related. Once the color of a star is identified, its temperature can be calculated through the use of scientific principles such as Wien’s Law.There are different types of stars...

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#Mẫu giáo

1

DH

Dương Hoàn Anh

26 tháng 4 2018

Đáp án là A.

Ý trong đoạn 2: Luminosity refers to the amount of energy radiated by a star, while magnitude refers to its brightness . Tính sáng đề cập đến lượng năng lượng bức xạ của một ngôi sao, trong khi cường độ đề cập đến độ sáng của nó

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LQ

Lê Quỳnh Anh

3 tháng 6 2017

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42. Life in the Universe Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.What sorts of planets...

Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Life in the Universe

Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.

What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.

The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem.
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two.
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth

Which is the topic of the passage?

A. The search for intelligent life

B. Conditions necessary for life.

C. Characteristics of extraterrestrial life

D. Life in our solar system

#Mẫu giáo

1

DH

Dương Hoàn Anh

3 tháng 6 2017

Đáp án B

Đâu là chủ đề của đoạn văn?

A. Cuộc tìm kiếm cuộc sống thông minh.

B. Những điều kiện cần thiết cho sự sống.

C. Đặc điểm của cuộc sống ngoài Trái Đất.

D. Sự sống trong hệ mặt trời của chúng ta.

Giải thích: Đoạn văn nói về những điều kiện cần thiết để phát triển sự sống trên một hành tinh

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LQ

Lê Quỳnh Anh

2 tháng 7 2019

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42. Life in the Universe Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.What sorts of planets...

Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Life in the Universe

Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.

What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.

The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem.
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two.
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth

It can be inferred from the paragraph 3 that ______.

A. the Earth is in the sun’s habitable zone

B. the Earth is tidally locked to the sun.

C. the sun varies in its luminosity.

D. variations in luminosity help life to develop

#Mẫu giáo

1

DH

Dương Hoàn Anh

2 tháng 7 2019

Đáp án A

Có thể được suy ra từ đoạn 3 rằng ______.

A. Trái đất nằm trong vùng có thể sinh sống của mặt trời.

B. Trái đất bị khóa chặt với mặt trời.

C. Mặt trời thay đổi theo độ sáng.

D. Sự biến đổi trong độ sáng giúp sự sống phát triển.

Được suy ra từ 2 câu đầu- đoạn 3: “The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years” – (Vùng có sự sống là khu vực xung quanh một ngôi sao nơi mà các hành tinh có thể phát triển sự sống. Đảm đương nhu cầu về chất lỏng chảy trên bề mặt, nó cho phép rằng hầu hết những ngôi sao có kích cỡ tương đương với mặt trời của chúng ta có thể duy trì vùng có sự sống qua hành tỉ năm) => Trái đất có sự sống là do nó nằm trong “habitable zones” của Mặt trời, mà “habitable zones” đó được Mặt trời duy trì qua hàng tỉ năm

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LQ

Lê Quỳnh Anh

11 tháng 1 2018

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42. Life in the Universe Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.What sorts of planets...

Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Life in the Universe

Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.

What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.

The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem.
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two.
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth

The word “which” in paragraph 3 refers to ______.

#Mẫu giáo

1

DH

Dương Hoàn Anh

11 tháng 1 2018

Đáp án C

Từ “which” ở đoạn 3 ám chỉ tới ______.

A. ngôi sao.

B. vùng.

C. khu vực

D. hành tinh.

Đọc cả câu: “The habitable zone is the region around a star in which planets can develop life” – (Vùng có sự sống là khu vực xung quanh một ngôi sao nơi mà những hành tinh có thể phát triển sự sống).

Như vậy “which” chỉ có thể là thay thế cho “region”.

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LQ

Lê Quỳnh Anh

20 tháng 2 2018

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42. Life in the Universe Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.What sorts of planets...

Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Life in the Universe

Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.

What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.

The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem.
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two.
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth

In can be inferred from paragraph 4 that______.

A. most stars have more than two planets in their habitable zone

B. no star has more than two planets in its habitable zone

C. it is not possible for a star to have three planets with life on them

D. for life to develop, a star must have at least two planets in its habitable zone

#Mẫu giáo

1

DH

Dương Hoàn Anh

20 tháng 2 2018

Đáp án C

Có thể được suy ra từ đoạn 4 rằng______.

A. Đa số các ngôi sao có nhiều hơn hai hành tinh nằm trong vùng có sự sống của chúng.

B. Không có ngôi sao nào có nhiều hơn hai hành tinh nằm trong vùng có sự sống của nó.

C. Không thể có một ngôi sao có ba hành tinh có sự sống.

D. Để cho sự sống phát triển, một ngôi sao phải có ít nhất hai hành tinh nằm trong vùng có sự sống của nó.

Dẫn chứng ở câu cuối- đoạn 4: “This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two” – (Điều đó có nghĩa là để phát triển sự sống, con số lớn nhất có thể của các hành tinh có điều kiện hỗ trợ sự sống nằm trong vùng có sự sống của một ngôi sao bất kì luôn là 2) => Một ngôi sao có nhiều nhất 2 hành tinh có sự sống nằm trong “habitable zone” của nó.

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LQ

Lê Quỳnh Anh

24 tháng 10 2019

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42. Life in the Universe Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.What sorts of planets...

Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Life in the Universe

Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.

What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.

The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem.
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two.
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth

All of the following are mentioned in the passage as necessary for the development of life except ______.

A. rock

B. carbon

C. oxygen

D. water

#Mẫu giáo

1

DH

Dương Hoàn Anh

24 tháng 10 2019

Đáp án C

Tất cả những điều sau đây được đề cập tới trong đoạn văn như là những điều cần thiết cho sự phát triển của sự sống, ngoại trừ ______.

A. đá.

B. khí các-bon.

C. khí ô-xi.

D. nước.

Dẫn chứng ở đoạn 2: “Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based (A), with liquid surface water (D) and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and and the Earth’climate depend. Since (as far as we know) all life is carbon-based (B), a stable carbon cycle is especially important” – (Hầu hết các nhà khoa học đồng ý rằng một hành tinh có sự sống phải có mặt đất, hoặc nền đá, cùng với bề mặt chất lỏng chảy trên đó và các chu trình địa hóa học sinh vật tương tự như sự vận động liên tục và sự trao đổi vật chất với môi trường. Chu trình đó bao gồm sự lưu thông của các nguyên tố và chất dinh dưỡng mà sự sống và khí hậu trên hành tinh đó phục thuộc vào. Bởi vì (như ta đã biết) thì mọi sự sống đều dựa trên các-bon, và một chu trình các-bon ổn định là đặc biệt quan trọng).

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