通读下面短文，掌握其大意，然后从短文后各题所给的四个选项中选择最佳的一项。

Switzerland is one of the more developed countries in Europe . It is well known ___21___ one of the cleanest countries in the world. The Swiss think that ____22____ is very important . The government has made laws which ___23___ everyone to recycle( 循环再利用). In 1998, the Swiss government passed a law which said that people could not ____24_____ away any electronic machines. _____25____, people were told to bring old ones, such as televisions, computers and fridges , to special centers when they didn’t need them. Many parts of the old machines are used again, and the parts that _____26_____ be used are thrown away. The government also charges a rubbish bag tax(税收). If people want their rubbish _____27_____, they must buy yellow stickers and put them _____28____their rubbish bags. In 2003, 47% of all rubbish in the cities was recycled. This ____29______ 70% of paper, 95%of glass, 71%of plastic bottles and 85-90%of cans. Until recently, people could get a small amount of money when they recycled their bottles. Recycling has become a ___30___ habit for the Swiss. Many countries should learn from the ___31_____. However, recycling in Switzerland is not without problems. In 2002 , street workers in Bern stopped collecting rubbish for 24 hours _____32____they thought that people were not as careful about recycling their rubbish as they should be. People were ___33_____ that so much rubbish was lying in the streets, and visitors ____34_____ Bern were disappointed to find the city was not as clean as they thought. The street workers hoped that people from Bern would learn that____35___ everyone’s responsibility to keep the city clean.

21. A. for　　　　　　　　　　　　　　 B. as　　　　　　　　　　 C. to　　　　　　　　　　　　　　 D. by

22. A. cleaning　　　　　　　 B. cycling　　　　　　　 C. recycling　　　　　 D. reproducing

23. A. want　　　　　　　　　 B. need　　　　　　　　 C. allow　　　　　　　　 D. require

24. A. put　　　　　　　　　　　　　　 B. take　　　　　　　　　 C. throw　　　　　　　　 D. fly

25. A. Instead　　　　　　　 B. But　　　　　　　　　 C. However　　　　　 D. So

26. A. can’t 　　　　　　　　 B. shouldn’t　　　　　 C. mustn’t　　　　　　 D. needn’t

27. A. to collect　　　　　　 B. collect　　　　 C. collecting　　　　　　　　 D. to be collected

28. A. on　　　　　　　　　　　 B. up　　　　　　　　　　 C. out　　　　　　　　　 D. off

29. A. included　　　　　　 B. including　　　　　 C. meant　　　　　　　 D. meaning

30. A. strange　　　　　　　 B. daily　　　　　　　　 C. usual　　　　　　　　 D. often

31. A. example　　　　　　　 B. life　　 　　 　　　 C. thoughts　　　　　　 D. mind

32. A. so　　　　　　　　　　　 B. because　　　　　　 C. so that　　　　　　　 D. until

33. A. unhappy　　　　　　 B. satisfied　　　　　　 C. sorry　　　　　　　　 D. surprised

34. A. to　　　　　　　　　　　 B. from　　　　　　　　 C. of　　　　　　　　　　 D. at

35. A. it’s　　　　　　　　　　　　　　 B. that’s　　　　　　　　 C. it　　　　　　　　　　　 D. it was

20. Which of the following is not used for giving advice?

A. You had better not watch a horror film since you get scared easily.

B. You mustn’t give your goldfish too much food.

C. The swimming pool isn’t open today. I don’t know where to go swimming.

D. Perhaps you should buy some souvenirs for your parents.

19. -__________?　 -Quite well, thank you .

A. What do you do　　　　　　　　　　 　　 B. What do you think of the film

C. How are you getting on with classmates　 　　 D. Are you good at maths

18. --Lucy wouldn’t mind lending you her dictionary.

　 ---I think she won’t, but I ___do so. I’ve already borrowed one.

　　 A. can’t　　　　　 B. mustn’t　　 　　　 C. needn’t　　 D. shouldn’t

17.-Could you tell me ________?　 -Certainly. In half an hour.

　　 A. when will the train to Beijing leave　　　 B. when would the train to Beijing leave

　　 C. when the train to Beijing leaves　　　　 D. When the train to Beijing left

16. - We must stop the hunters hunting the Tibetan antelopes(藏羚羊) in Tibet.

- I agree with you. If it ________, they will ________ soon.

　　　　 A. goes, disappear　　　　　　　　　　　 B. goes up, are disappearing　　　

C. goes on, be disappeared　　　　　　　　 D. goes on, disappear