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7. The government has laws to (限制) air pollution.

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1.澄蓝的湖泊 2. 使它保持那样

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   In 1620,about half the USA was covered by forests. Today the forests have almost gone. A lot of good land has gone with them,leaving only sand (沙地). China doesn’t want to copy the USA’s example. We’re planting more and more trees. We’ve built the “Great Green Wall” of trees across northern part of our country. The Great Green Wall is 7 ,000 kilometres long,and between 400 and 1,700 kilometres wide. It will stop the wind from blowing the Earth away. It will stop the sand from moving towards the rich farmland in the south. More “Great Green Walls” are needed. Trees must be grown all over the world. Great Green Walls will make the world better.

() 1. In 1620,about the USA was covered by forests.

   A. a third   B. half    C. two thirds   D. a fourth

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   A. sand   B. water   C. wind   D. forests

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   A. 7,000 kilometres   B. 1,700 kilometres

    C. 7,000 metres   D. 400 kilometres ’

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    C. some countries   D. every part of the world

() 5. will make the world better.

   A. The Great Wall   B. Tall buildings

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