题目内容
________ trees must be planted every year．
- A.Thousands of
- B.Thousand of
- C.Thousands
- D.Thousand
A
解析：
表示一个具体数字时，thousand一词不加s，也不与of连用，首先排除B和D．表示一个不确定的数字时，thousand后要加s，也要与介词of连用，意思是“数千的”，故选A．
解析：
表示一个具体数字时，thousand一词不加s，也不与of连用，首先排除B和D．表示一个不确定的数字时，thousand后要加s，也要与介词of连用，意思是“数千的”，故选A．
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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 .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。
【小题1】In 1620 ,about_____ the USA was covered by forests
| A．a third | B．half | C．to thirds | D．a fourth |
| A．sand | B．water | C．wind | D．forests |
| A．7,000 kilometers | B．1,700 kilometers |
| C．7,000 meters | D．400 kilometers |
| A．China | B．the USA |
| C．some countries | D．every part of the world |
| A．the Great Wall | B．Tall buildings |
| C．Great Green Wall | D．Flowers and glass |