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Plans grow(46)in almost every part of the world. We see(47)such plants as flowers, glass, and tree nearly every day. Plants grow high on moutaintops, far in the oceans, and in many deserts and(48)polar regions
Without plants, there could be not life on earth. Man could not live without air of food and so he could not live without plants. The oxygen in the air we breathe comes from plants. The food we eat also comes from plants or from animals that eat plants. We build houses and make many(49)useful products from lumber cut from trees. (50) Much of our clothing is made from the fitbers of the cotton plants.
Scientists belive there are more than 350,000 species of plants, but no one knowns for(51)sure. Some of the smallest plants, called diatoms, can be seen only with a(52)microscope . A drop of the water may hould as many as 500 diatoms. The largest living things are the giant sequoia trees of California. Some of them stand more than 290 feet high and measure over 30 feet wide
Scientist(53)divide all living things into two main groups - plants and animals. It is usually easy to tell the two(54)apart . Almost all kinds of plants stay in one place, but nearly all species of animals move about under their own power. Most plants make their own food from air, sunglight, and water. Animals cannot make their own food. The basic units of all life, called cells, are also different in plants and animals. Most plants have thick wall that(55) contain a material called cellulost. Animal cells dl not have this material.
Fill in the blanks:
Maybe you recycle cans, glass and paper. Do you know that nature recycles, too? One of the things nature (1)...recycles... is water.Water goes from oceans, lakes and river into the air. Water falls from the air as (2)...rain... or snow. Rain and snow eventually find their way back to the ocean. Nature's recycling program for water is (3)...called... the water cycle.
The water cycle has 4 stages: storage, evaporation, precipitation and runoff. Water on the Earth gets stored (4)...in... oceans, lakes, rivers, ice and even underground. Water goes from storage into the atmosphere by a process called evaporation. When water evaporates, it changes from a liquid (5)...into... a gas, called water vapor. Water vapor goes up into (6)...the... atmosphere. Water returns to the Earth as precipitation in rain or snow by changing into drops of water (7)...when... the air gets cold enough. Clouds are collections (8)...of... water droplets. Most precipitation falls into the oceans and go right back into storage.
Water that falls on land always flows from (9)...higher... places to lower ones. This flow is called runoff. Water from land flows into streams. Streams join together to make (10)...rivers... and eventually the water flows into storage in the oceans.
Fill in blank with one suitable word to complete the text.
IN THE BATHROOM
Wasting water wastes electricity. Why? Because the biggest use of (1) =>electricity in most cities is supplying water and cleaning it up after it's been (2)=>used ! About 75 percent of the (3) =>water we use in our homes is used in the bathroom. Unless you have (4)=> a low flush toilet, for example, you use about five gallons (5)=> to seven gallons of water with every flush! A leaky toilet can (6)=>waste more than 10,000 gallons of water a year. Wow!
Dripping faucets (7)=> are bad, too. A faucet that leaks (8)=> enough water to fill a soda bottle every 30 minutes will waste 2,912 gallons of water a year.
Another simple way to (9)=> save water and energy is to take shorter showers. You'll use less hot water and water heaters account (10)=> for nearly 1/4 of your home's energy use.
Help, help, help ><
Our oceans are becoming extremely polluted. Most of this pollution comes from the land, which means it comes from people. Firstly, there is raw sewage, which is pumped directly into the sea. Many countries, both developed and developing, are guilty of doing this. Secondly, ships drop about 6 million tons of garbage into the sea each year. Thirdly, there are oil spills from ships. A ship has an accident and oil leaks from the vessel. This not only pollutes the water, but it also kills marine life. Next, there are waste materials from factories. Without proper regulations, factory owners let the waste run directly into the rivers, which then leads to the sea. And finally, oil is washed from land. This can be the result of carelessness or a deliberate dumping of waste.
Water kills thousands of people and ____destroys _________(1) many acres of crops every year, but water also gives life to all living things in the world.
Without water, life would be unthinkable. We _____must ______(2) have water to grow our food, feed the birds and animals _____in _______(3) our homes, grow forests and produce electricity. We use waterways_____to _____ (4) carry our goods of trade. Even the human body, which is seventy parts of one hundred of water itself, ______cannot _____(5) exist for long without water.
Ever ______since _____(6) the earth began, large quantities of water have been used by living things. Yet for every drop of water that is taken from one place, another drop is put back from somewhere else.
Nature has a very clever ____way ______(7) of carrying water from cloud to land and sea and back to cloud. No water has been lost.
But nature does not put water where and when we need it. __While _______(8) some men are drowning, others in another part of the world are dying of thirst. Thus, people all ____over _____(9) the world are trying to bring water to places where it is scarce, to control its flow in times of floods and to make greater ____use ______(10) of it.
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