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根据短文内容选词填空。(Choose the right words to fill in the blanks．)
Damage to the ozone layer
The writers tell us that‘ozone is a gas 1 occurs 20－50 km above the ground．It forms an essential protective layer around the earth． 2 it, the sun would burn us up．’
We are making holes in the ozone layer mainly by using chemicals 3 CFCs．We use these in fridges and spray cans, and to make plastic items such as fast food boxes．
Destruction of the rain forests
The burning and cutting down of trees is making the Greenhouse Effect 4 because trees take in CO2．It also causes erosion of the soil and flooding, as 5 as destroying the people and animals who make the forests their home．
Bad habits
Many of our habits cause pollution, especially our habit of using things 6 and then throwing them away．This creates massive mountains of rubbish．We don't know 7 to do with the rubbish and it pollutes our land and sea．For example, seven billion drink cans are thrown away in Britain each year．That is 8 to reach from the earth to the moon．
How can we save the earth?
This book's idea is that we should become 9 consumers．That is, we should only buy and use things that do not damage the environment．And we should buy only from companies 10 do not damage the environment either．
1．________ 2．________ 3．________ 4．________ 5．________
6．________ 7．________ 8．________ 9．________ 10．________
阅读理解
Why does it rain on the road?A small boy and his father were walking home in the country， when it suddenly began to rain hard． They did not have umbrellas with them， and there was no place to hide from the rain， so they were soon very wet．
For a long while they were walking home through the rain， the boy wag thinking． Then at last he turned to his father and said to him， “Why does it rain， father? It isn't nice， is it?”
“No，it isn't very nice， but it's very useful， Tom，” answered his father．"It rains to make the Vegetables grow for us，and to make the grass grow for the cows and sheep．"
Tom thought about this for a few seconds， and then he asked， “Then，why does it rain on the road．too?”
根椐短文判断对错(正确的写T，错误的写F)
( )(1)When the father and his． son started to walk home， it was raining hard．
( )(2)They went to a big tree to hide from the rain．
( )(3)The rain stopped when they got home．
( )(4)The rain isn't very nice， but it is useful．
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