Complete the following sentences with the present perfect or past simple. 1. Sam ……..a new cell phone a few months ago. (buy) 2. I didn't know that he bought a new cell phone. Yes, he ………….it for a fe...

MT

mạc trần

6 tháng 7 2021 - olm

Complete the following sentences with the present perfect or past simple. 1. Sam ……..a new cell phone a few months ago. (buy) 2. I didn't know that he bought a new cell phone. Yes, he ………….it for a few months now. (have) 3. Last year we ……………….to Scotland for our holidays. (go) 4. You look relaxed! Yes, I ………………on vacation. (just been) 5. I can't join you now because I ……………………..my homework yet. (not do) 6....

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#Tiếng anh lớp 6

2

LM

Lê Minh Vũ

VIP

6 tháng 7 2021

1.bought

2. has had

3. went

4. have just been

5. haven't done

6. did

7. haven't slept

8. have had

9. was an accident

10. have lost

11. has lived

12.did you stay

13. Have you ever had

14. has started

15. didn't have

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XO

Xyz OLM

6 tháng 7 2021

1) bought ; 2) have had ; 3) went ; 4) just have been ; 5) haven't done 6) did ; 7) didn't sleep ;

8) had ; 9) was ; 10) have lost ; 11) has lived ; 12) did you stay ; 13) Have you ever had ;

14) has started ; 15) didn't have

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D

datcoder

CTVVIP

25 tháng 11 2023

Complete the sentences. Use the past simple or present perfect form of the verbs in brackets.1 Joe _________ (live) in London between 2009 and 2012.2 'Emeli Sandé _________ (just/bring out) a new record. _________ (you/hear) it yet?''Yes, I _________ (download) it last night.'3 'Sorry I'm late! _________ (you/be) here long?''No, I _________ (just/arrive).'4 _________ (you/ever/visit) the USA?' 'Yes, I _________ (go) there last summer.’5 _________ (you/eat) before you _________ (leave)...

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#Tiếng anh lớp 11

1

NV

Nguyễn Việt Dũng

CTVVIP

25 tháng 11 2023

1 Joe lived (live) in London between 2009 and 2012.

(Joe sống ở London từ năm 2009 đến 2012.)

2 'Emeli Sandé has just brought out (just/bring out) a new record. Have you heard it (you/hear) it yet?'

'Yes, I downloaded (download) it last night.'

('Emeli Sandé vừa mang về một bản ghi. Bạn đã nghe chưa?'

'Vâng, tôi đã tải nó tối qua.')

3 'Sorry I'm late! Have you been (you/be) here long?'

'No, I have just arrived (just/arrive).'

('Xin lỗi tôi tới trễ! Anh ở đây lâu chưa?”

'Không, tôi vừa mới đến.')

4 Have you ever visited (you/ever/visit) the USA?' 'Yes, I went (go) there last summer.’

(Bạn đã bao giờ đến thăm Hoa Kỳ chưa?' 'Vâng, tôi đã đến đó vào mùa hè năm ngoái.')

5 Did you eat (you/eat) before you left (leave) home?'

'Yes, I did

(Bạn đã ăn trước khi bạn rời khỏi nhà hả?'

'Vâng, tôi đã ăn.')

6 I have had (have) this MP3 player for a year.

(Tôi đã có máy nghe nhạc MP3 này được một năm.)

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NN

Nhi Nguyễn

15 tháng 8 2021

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#Tiếng anh lớp 7

2

KY

Khinh Yên

15 tháng 8 2021

Complete the following sentences.Use the past simple and present perfect form of the verbs in brackets:

1.It ( start)…………started………………..raining an hour ago.

2.I ( know )……have known…………………….Lan for some months.

3.When…………did……………..Nam and Hoa first ( meet)………met…………………..?

4.We ( not see )………………haven't seen…………………Nga since Sunday.

5.Lan ( be )…………………has been………………………in the USA for 2 years.

6.I ( go)…………………went…………………to bed at 11 o’clock last night.

7.They ( move)………………moved……………….to London in 2003

8.They ( live)…………have lived…………… in Ho Chi Minh City since January.

9.That’s a very old bike. He ( have)…………has had………………………it for a long time

10.I ( buy)…………………bought……………….the motorbike 5 years ago.

11.Peter ( be)…………has been………………………..ill for aweek.

12. They ( buy) ……have bought…………..that car since last week

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OY

OH-YEAH^^

15 tháng 8 2021

4. haven't saw

5. has

6. went

7. moved

8. have lived

9. had

10. bought

11 was

12. have bought

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LQ

Lê Quỳnh Anh

9 tháng 9 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

What definition is true of a cell phone?

A. The first product of two famous corporation.

B. A hand-held wireless communication device

C. Something we use just for playing games.

D. A version of walkie- talkie

#Mẫu giáo

1

DH

Dương Hoàn Anh

9 tháng 9 2018

Đáp án B

Định nghĩa nào là đúng của điện thoại di động?

A. Sản phẩm đầu tiên của hai tập đoàn nổi tiếng.

B. Một thiết bị giao tiếp không dây cầm tay.

C. Một cái gì đó chúng ta sử dụng chỉ để chơi trò chơi.

D. Một phiên bản của bộ đàm

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LQ

Lê Quỳnh Anh

6 tháng 12 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

To whom did Cooper make his first cell phone call?

A. His assistant at Motorola.

B. A person on New York street.

C. A member of Bell Laboratories.

D. The director of his company

#Mẫu giáo

1

DH

Dương Hoàn Anh

6 tháng 12 2017

Đáp án C

Cooper đã thực hiện cuộc gọi điện thoại di động đầu tiên của mình tới ai?

A. Trợ lý của anh tại Motorola.

B. Một người trên phố New York.

C. Một thành viên của phòng thí nghiệm Bell.

D. Giám đốc công ty của anh ta

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LQ

Lê Quỳnh Anh

18 tháng 8 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

The word “ they” in paragraph 2 refer to________

A. Walkie – talkies

B. Walkie - talkies, telephones

C. telephones and cell phones

D. Walkie - talkies, telephones and cell phones

#Mẫu giáo

1

DH

Dương Hoàn Anh

18 tháng 8 2019

Đáp án D

Từ “họ” trong đoạn 2 đề cập đến _________

A. Walkie - talkies

B. Walkie - talkies, điện thoại

C. điện thoại và điện thoại di động

D. Walkie - talkies, điện thoại và điện thoại di động

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PH

Phạm Huy Hoàng

19 tháng 2 2020 - olm

Complete the sentences with the present simple, present perfect or past simple forms of the verbs in the blanks. Don't use contractions. 1.He often (go) ………………..for a swim with his brother at weekends.2.John Baird (invent) ………………….the television in 1925.3.We (learn) …………………….to play table tennis for four years.4.The boxing match (start) ……………………30 minutes ago.5.It is the first time I (visit)...

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#Tiếng anh lớp 6

1

NK

nabi kotohina

19 tháng 2 2020

1.goes

2.invented

3.learn

4.started

5. visited

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LQ

Lê Quỳnh Anh

25 tháng 11 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

What is the main idea of the passage?

A. The increasing number of people using cell phone.

B. The difference between cell phones and telephones.

C. The history of a cell phone

D. How Cooper competed with AT& T

#Mẫu giáo

1

DH

Dương Hoàn Anh

25 tháng 11 2018

Đáp án C

Ý tưởng chính của đoạn văn là gì?

A. Số lượng ngày càng tăng của người sử dụng điện thoại di động.

B. Sự khác biệt giữa điện thoại di động và điện thoại.

C. Lịch sử của điện thoại di động

D. Làm thế nào Cooper cạnh tranh với AT & T

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LQ

Lê Quỳnh Anh

22 tháng 8 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

What information is INCORRECT about a walkie- talkie?

A. It has one channel

B. It was first designed in 1973

C. It can be used within a distance of a mile.

D. Only one person can talk at a time

#Mẫu giáo

1

DH

Dương Hoàn Anh

22 tháng 8 2018

Đáp án B

Thông tin nào không đúng về thiết bị “nói chuyện cầm tay”?

A. Nó có một kênh

B. Nó được thiết kế lần đầu tiên vào năm 1973.

C. Nó có thể được sử dụng trong vòng một dặm.

D. Chỉ có một người có thể nói chuyện cùng một lúc

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LQ

Lê Quỳnh Anh

16 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

The word "duplex" is closest meaning to ________

A. having two parts

B. quick

C. modern

D. having defects

#Mẫu giáo

1

DH

Dương Hoàn Anh

16 tháng 10 2019

Đáp án A

Từ "duplex" gần nghĩa với ________.

A. có hai phần

B. nhanh chóng

C. hiện đại

D. có khuyết tật

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LQ

Lê Quỳnh Anh

25 tháng 2 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 36 to 42 Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set...

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 36 to 42

Since the dawn of time, people have found ways to communicate with one another. Smoke signals and tribal drums were some of the earliest forms of communication. Letters, carried by birds or by humans on foot or on horseback, made it possible for people to communicate larger amounts of information between two places. The telegram and telephone set the stage for more modern means of communication. With the invention of the cellular phone, communication itself has become mobile.

For you, a cell phone is probably just a device that you and your friends use to keep in touch with family and friends, take pictures, play games, or send text message. The definition of a cell phone is more specific: it is a hand- held wireless communication device that sends and receives signals by way of small special areas called cells.

Walkie - talkies, telephones and cell phones are duplex communication devices: They make it possible for two people to talk to each other. Cell phones and walkie- talkies are different from regular phones because they can be used in many different locations. A walkie- talkie is sometimes called a half- duplex communication device because only one person can talk at a time. A cell phone is a full- duplex device because it uses both frequencies at the same time. A walkie-talkie has only one channel. A cell phone has more than a thousand channels. A walkie- talkie can transmit and receive signals across a distance of about a mile. A cell phone can transmit and receive signals over hundreds of miles. In 1973, an electronic company called Motorola hired Martin Cooper to work on wireless communication. Motorola and Bell Laboratories (now AT& T) were in a race to invent the first portable communication device. Martin Cooper won the race and became the inventor of the cell phone. On April 3, 1973, Cooper made the first cell phone call to his opponent at AT& T while walking down the streets of New York city. People on the sidewalks gazed at cooper in amazement. Cooper's phone was called A Motorola Dyna- Tac. It weighed a whopping 2.5 pounds (as compared to today's cell phones that weigh as little as 3 or 4 ounces)

After the invention of his cell phone, Cooper began thinking of ways to make the cell phone available to the general public. After a decade, Motorola introduced the first cell phone for commercial use. The early cell phone and its service were both expensive. The cell phone itself cost about $ 3, 500. In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 1981, a second cellular phone system was started in the Washington,D.C and Baltimore area. It took nearly 37 years for cell phones to become available for general public use. Today, there are more than sixty million cell phone customers with cell phones producing over thirty billion dollars per years

When did Motorola introduce the first cell phones for commercial use?

A. In the same years when he first made a cell- phone call.

B. In 1981

C. In 1983.

D. In the same year when AT& T constructed a cell phone system

#Mẫu giáo

1

DH

Dương Hoàn Anh

25 tháng 2 2019

Đáp án C

Motorola đã giới thiệu điện thoại di động đầu tiên cho mục đích thương mại khi nào?

A. Trong cùng một năm khi ông lần đầu tiên thực hiện một cuộc gọi điện thoại di động.

B. Năm 1981.

C. Năm 1983.

D. Trong cùng năm đó, AT & T đã xây dựng một hệ thống điện thoại di động

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