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 800 B.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. From　　　　 7._________________

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

the remains of the tools, fishing hooks and even picture　　  9._________________

on rocks what together prove the experience of an　　　　 10._________________

<

ancient civilization.

 

答案：
解析：

1.         完全正確

2.         it指西非，根據(jù)前一句可知應(yīng)該是被分割

3.         后面已經(jīng)有謂語了，所以這里的謂語只能是定語從句里的謂語

4.         used to曾經(jīng)是，be used to習(xí)慣于

5.         be covered with被…所覆蓋

6.         plenty of很多，沒有a

7.         fish是可數(shù)名詞，不能用much

8.         這句話沒有必要用過去完成時，過去完成時表示的是過去的過去。

9.         前面都是復(fù)數(shù)，這里也應(yīng)該一樣，發(fā)現(xiàn)的圖畫應(yīng)該不止一幅

10.     這里的先行詞在后面的句子里做主語，不能用what來引導(dǎo)

 


提示：

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

4. was used---used    5. in---with    6. a plenty---plenty    7.  much---many   

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

 


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