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 .China doesn’t want to copy the USA’s example.We’re planting more and more tress .We’ve built the “Great Green Wall ”of tress across northern pat of our country .The “Great Green Wall”is 7,000 kilometers long ,and between 400 and 1,700 kilometers 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 Wall ”are needed .Trees must be grown all over the world. “Great Green Wall ”will make the world better .

根据短文内容，选择正确答案。

1.In 1620 ,about_____ the USA was covered by forests

2. A lot of good land has gone with _____.

3. The “Great Green Wall”In China is _____long

4. Trees must be grown in _____.

5._____ will make the world better .

①Forests help to keep water from running away, so drought does not often happen. The trees in the forests can keep raindrops from hitting the soil directly, and the dead leaves on the ground can also keep the water from running away.②

Chinese people don’t want to see more floods and droughts. We have built the “ Great Green Wall” of trees across the northern part of our country.③ Thanks to the “ Great Green Wall”, we can prevent the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland. That’s why more “ Great Green Walls” are needed. Trees must be planted all over the world.④

根据短文内容，从题中所给的A、B、C、D四个选项中，选择最佳答案。（10分）

1. “Great Green Wall will make the world better.” This sentence should be put in      .

2.       can help to keep water from running away.

3. The reason of building “ Great Green Wall”is        .

4. We have built the “ Great Green Wall” of trees        of China.

5.From the passage, we can know which is wrong.

These young trees must ______.

In 1620, about half the U.S.A. was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. China doesn’t want to copy the U.S.A.’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 kilometers long, and between 400 and 1,700 kilometers 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.

2. A lot of good land has gone with ______.

3. The Great Green Wall in China is ______ long.

4. Trees must be grown in ______.

5. ______ will make the world better.

1These young trees must        .

A. look after well                   B. be well looked after

C. take good care of                 D. be taken good care