34．A．aimed　　　　　 B．connected　 　 　　　 C．indicated　　 　 D．represented

33．A．harmed　　　　　　　　　 B．helped　　　 　　　 C．improved　　 　 D．reduced

32．A．made　　　　　　　　　　　 B．took　　　 　　 　　　 C．had　　　 　　 D．brought

31．A．beneficial　　　　　　　 B．friendly　　 　　 　　　 C．tiring　　　　 D．unhealthy

64. A. events　　 B. questions　　　C. hobbies　　 D. opportunities

　　　　　　　　　　　　　　　　　　 　H)

Exercise is often said to be good for everyone．But a new study has shown that exercise could be _31　 especially for people past middle age．The study was done with mice．It showed that although mild exercise 　32　 　a good effect on the muscles of young mice, it 33_the muscles of mice past middle age．

The three groups of mice in the experiment were _34__in age at young, middle-aged, and elderly humans．The mice were__35_on a thread-mill (踏车) 30 minutes a day for a five-week period．At the end of that time, the young mice’s leg muscles had increased almost 30 percent in weight, but those of the old mice were reduced by 25 percent．No_36_pattern showed for the middle-aged mice．

David Gershon, an expert who carried out the experiment, explained that the older mice’ muscles were probably already_37_down and that exercise worsened the _38_．An earlier study by Gershon showed that middle-aged mice benefited from exercise if they started exercising young and continued it．

It’s clear that because the tests were done on mice, drawing conclusions about humans is too early．But the studies do not totally _39_the theory that exercise is good under any conditions．Let’s use the tests on mice as a _40__for other studies．

63. A. possibility　 B. feasibility　　 C. hope　　　 D. result

62. A. every　　 B. no　　 C. this　　　　 D. another

61. A. unless　　 B. if　　 C. until　　　　 D. because

60. A. prepare　B. regret　C. decline　　 D. expect

59. A. offer　　　 B. hesitate　　　 C. refuse　　　　 D. mean