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第二部分：英语知识运用（共两节, 满分35分）
Exercise is often said to be good for everyone．But a new study has shown that exercise could be _21 especially for people past middle age．The study was done with mice．It showed that although mild exercise 22 a good effect on the muscles of young mice, it 23_the muscles of mice past middle age．
The three groups of mice in the experiment were _24__in age at young, middle-aged, and elderly humans．The mice were__25_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_26_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_27_down and that exercise worsened the _28_．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 _29_the theory that exercise is good under any conditions．Let’s use the tests on mice as a _30__for other studies．
21．A．beneficial B．friendly C．tiring D．unhealthy
22．A．made B．took C．had D．brought
23．A．harmed B．helped C．improved D．reduced
24．A．aimed B．connected C．indicated D．represented
25．A．directed B．driven C．hung D．placed
26．A．clean B．clear C．proper D．visible
27．A．breaking B．failing C．letting D．slowing
28．A．body B．condition C．situation D．state
29．A．appreciate B．assist C．promote D．support
30．A．bridge B．means C．proposal D．warning
At 3：00 a.m., Jack Mills was sitting at the controls of the mail&nbs
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