19. Why do the leaves of a tree never actually touch those of others?

A. Because it’s a way to prevent the spread of any tree diseases.

B. Because it makes it less difficult for insects to eat leaves.

C. Because animals can jump between them.

20. How much rain can rainforests produce sometimes in a year?

A. About 75% of their own rain.

B. As much as 430 inches.

C. At least 80 inches.

第二部分 英语知识运用

第一节、单项填空(共15小题, 每小题1分，满分15分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡相应番号后将该项涂黑。

21.We are said to be living in ________ Information Age, ________ time of new discoveries and great changes.

A. an; the B. 不填; the C. 不填; a D. the; a

22. Was it ________ she said or something that she did ________ you were angry at so much?

A. what; that B. that; which C. that; what D. what; which

23. Read this story, _________you will realize that not everything can be bought with money.

A. or B. and C. but D. so

24. To show our respect, we usually have to take off our gloves_________ we are to shake hands with.

A. whichever B. whenever C. whoever D. wherever

25. I am sick of rain and the bad weather! Hopefully, when we _________ up tomorrow morning, the sun_________.

A. wake; will be shining B. will wake; is shining

C. will wake; shines D. wake; shines

26. It is politely requested by the hotel manager that radios__________ after 11 o’clock at night.

A. were not played B. not be played

C. not to play D. did not play