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第一节：完形填空（共10小题；每小题2分，满分20分）
阅读下面短文，掌握其大意，然后从21～30各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
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．
阅读下面短文，掌握其大意，然后从21～30各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
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．
