West Africa today is separated from North Africa 1. by the Sahara Desert, but it

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West Africa today is separated from North Africa 1._________________

by the Sahara Desert, but it has not always separated 2._________________

in this way. The huge area of the very dry land makes 3._________________

up the Sahara was used to be rich. Up to about 800B.C.4._________________

the Sahara was covered in tall trees and green grass.5._________________

There were a plenty of animals. Broad rivers can run 6._________________

through it, and there were much fish in them. From7._________________

one end of the Sahara to the other, scientists hadfound 8._________________

the remains of the tools, fishing hooks and evenpicture 9._________________

on rocks what together prove the experience of an10._________________

ancientcivilization.

答案：

解析：

1. 完全正确

2. it指西非，根据前一句可知应该是被分割

3. 后面已经有谓语了，所以这里的谓语只能是定语从句里的谓语

4. usedto曾经是，be used to习惯于

5. becovered with被…所覆盖

6. plentyof很多，没有a

7. fish是可数名词，不能用much

8. 这句话没有必要用过去完成时，过去完成时表示的是过去的过去。

9. 前面都是复数，这里也应该一样，发现的图画应该不止一幅

10. 这里的先行词在后面的句子里做主语，不能用what来引导

提示：

1.√ 2. separated---beenseparated 3. makes---that/which makes

4. wasused---used 5.in---with 6. aplenty---plenty 7. much---many

8. had---have 9. picture---pictures 10. what---which / that