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1. A. tell B. ask C. give D. get
2. A. not B. too C. to D. also
3. A. cut down B. climb up C. walk past D. look at
4. A. many B. every C. the first D. from
5. A. how big B. how long C. how old D. how much
6. A. trees B. leaves C. people D. rings
7. A. big B. thin C. small D. thick
8. A. climate B. trees C. things D. animal
9. A. people B. things C. climate D. life
10. A. how B. why C. when D. while
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| 完形填空。 | |||
| We know that trees are useful in our everyday life. They __1__ us many things, such as wood, oxygen, rubber, medicines and many other things. They can __2__ tell us a lot about our climate. The following are the reasons. If you __3__ a tree, you can see that it has many rings. Most trees grow one new ring __4__ year. Because of the reason, we know __5__ a tree is. A tree over a hundred years old means that it has more than a hundred __6__ . When the climate is dry or very cold, the trees do not grow very much and their rings are usually __7__ . When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the __8__ changed suddenly. If we look at the rings on this tree, we can learn about the __9__ for a hundred years. We can see __10__ our climate is changing today. | |||
| ( ) 1．A．tell ( ) 2．A．not ( ) 3．A．cut across ( ) 4．A．every ( ) 5．A．how big ( ) 6．A．trees ( ) 7．A．big ( ) 8．A．climate ( ) 9．A．people ( ) 10．A．how |
B．ask B．too B．climb up B．many B．how long B．leaves B．thick B．trees B．things B．why |
C．give C．to C．walk past C．the first C．how old C．people C．small C．rings C．climate C．when |
D．get D．also D．look at D．from D．how much D．rings D．thin D．animals D．life D．while |
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根据短文内容，从短文后的选项中选出适当的选项补全短文。
The earth is about 4,600 million years old. We humans have lived on the earth for only 35,000 years, but during this period we have changed our planet a lot in many ways. 1
All over the world, people have cut down millions of trees, so more and more kinds of animals and plants are disappearing. In big cities, cars and buses have polluted the air. Factories have also polluted the land and the water.
2 It is important to the earth. But now air pollution is destroying it and that has made a very big hole in the ozone layer (臭氧层). 3 This is very dangerous because it can cause cancer.
Carbon dioxide (CO2) in the air has increased a lot. 4 it has formed a "blanket" (毛毯) around the each. 5 This makes our earth become warmer and warmer. Therefore, this causes the level of the ocean to rise.
All these problems are very serious. We must do something to stop our earth from being polluted anymore.
| A. The heat from the sun can' t escape, so the temperature is rising. B. Too much harmful light from the sun passes through it and reaches the earth directly, C. Some things we've done are very good for the earth while some are bad. D. Around the earth, there’s a special kind of oxygen (O2) called "ozone" (O3). E. It mainly comes from different kinds of burning materials. |
根据短文内容，从短文后的选项中选出适当的选项补全短文。
The earth is about 4,600 million years old. We humans have lived on the earth for only 35,000 years, but during this period we have changed our planet a lot in many ways. 1
All over the world, people have cut down millions of trees, so more and more kinds of animals and plants are disappearing. In big cities, cars and buses have polluted the air. Factories have also polluted the land and the water.
2 It is important to the earth. But now air pollution is destroying it and that has made a very big hole in the ozone layer (臭氧层). 3 This is very dangerous because it can cause cancer.
Carbon dioxide (CO2) in the air has increased a lot. 4 it has formed a "blanket" (毛毯) around the each. 5 This makes our earth become warmer and warmer. Therefore, this causes the level of the ocean to rise.
All these problems are very serious. We must do something to stop our earth from being polluted anymore.
|
A. The heat from the sun can' t escape, so the temperature is rising. B. Too much harmful light from the sun passes through it and reaches the earth directly, C. Some things we've done are very good for the earth while some are bad. D. Around the earth, there’s a special kind of oxygen (O2) called "ozone" (O3). E. It mainly comes from different kinds of burning materials. |
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