三、完形填空(共15小题，每小题2分，共30分)
通读下面的短文，掌握其大意。然后从每小题的四个选项中选出可填入相应空白处的最佳选项。
Living one' s life is really like driving on a highway. First,to drive well,the driver must carefully examine the 21 of his car,just as he cares for his own health. Once he goes on the highway,he must 22 certain rules for his own safety. Just as he must obey certain rules of society in order to be a decent (体面的) human being. For example, on the highway,he is 23 to keep a constant speed which can be compared with his 24 life. Neither driving nor living must be taken at too 25 a speed nor at too slow a speed. If he drives over 26,the police will give him a ticket,just as he will be arrested when he breaks the law. Acting too conservatively (保守地), he will be called old-fashioned 27 others as they drive at the proper speed. When he wants to change lanes, he must pay 28 to what he is doing and check in every direction. It is sometimes dangerous to change our way of life 29 one can be sure of success. He 30 not make any unnecessary changing of lanes which may be dangerous. Finally, he must discover where he is now by recognizing some 31 appearing now and then. If he takes the wrong way,he must return to the right as 32 as he can.
But he may thus lose 33 and energy both on the road and in life. On the whole, driving on a highway and living one' s life are both hard work.34 if he is careful and serious enough,35will provide him much pleasure.
21. A. seat
B. condition
C. petrol
D. passenger
22. A. listen to
B. find
C. follow
D. insist on
23. A. glad
B. required
C. made
D. anxious
24. A. broken
B. bad
C. good
D. continuous
25. A. large
B. fast
C. limited
D. expected
26. A. speed
B. slow
C. order
D. willing
27. A. persuading
B. getting
C. interrupting
D. refusing
28. A. notice
B. attention
C. signs
D. regards
29. A. if
B. when
C. unless
D. because
30. A. dare
B. need
C. may
D. should
31. A. signs
B. roads
C. posters
D. people
32. A. possible
B. soon
C. much
D. hard
55. A. money
B. luck
C. time
D. trust
34. A. Therefore
B. But
C. And
D. As
35. A. our
B. she
C. they
D. your
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