11. George Washington was born in 1732 in a rich family in _______ is now the state of Virginia. 　A. which　　　 B. where　　　　　 C. that　　　　　 D. what

10. Every possible means _______to prevent the air pollution, but the sky is still not clear. A. are being used　 　B. have been used　 C. has been used 　D. had been used

9. He’s _______ to fail the exam if he doesn’t do any revision.

　 A. near　 　　B. fit　 　　C. bound　 　D. easy

8. One of the men held the view ____ the book said was right.

A. what that　　 B. what 　C. that　　 　D. that　 what

7. His hard work paid ____ when he got the result.

　 A. off　 　B. over　 　　　C. out　 　D. back

6. Are you suggesting that I _____ too old for the job?

　 A. am　 　B. should be　 　C. be　 　D. was

5. Seeing your picture, I couldn’t resist _____ the days _____ we spent together.

　 A. to think of; when　 　　B. to think of; which　

C. thinking of; which 　　　D. thinking of; when

4. ______ what we have now, we can’t afford so large a house.

　 A. In　 B. At　 C. With　 D. Near

1. They have no idea at all ________.

A. where he has gone 　　　　B. where did he go

C. which place has he gone 　　D. where has he gone

2 _______news came ________an unknown disease was spreading in the area .

A. Disturbing / that　 　　　　B. Disturbed / which　

C. Disturbing / which　 　　　D. Disturbed / what

3 He was _________down for several days after he heard　 the bad news .

A. broken　　　　 B. cast　　　 C. cut　　　 D. discouraged

48、在下列4种不同的实验条件下：

①0.10%CO₂；30℃；　　　 ②0.10%CO₂；20℃；

③0.03%CO₂；30℃；　　　 ④0.03%CO₂；20℃

测定了不同的光照强度对某种植物光合作用速率的影响，结果如图5-2-1所示。对实验②、实验③和P点起限制作用的因素分别是　　　　　　　　　 、　　　　　　　　　 、　　　　　　　　　　 。