120. In Europe, schoolchildren devote time during each school day to calisthenics. North American schools rarely offer a daily calisthenics program. Tests prove that North America
children are weaker, slower, and shorter-winded than European children. We must conclude that North American children can be made physically fit only if they participate in school calisthenics on a daily basis.
Which one of the following is assumed in the passage?
A. All children can be made physically fit by daily calisthenics.
B. All children can be made equally physically fit by daily calisthenics.
C. Superior physical fitness produces superior health.
D. School calisthenics are an in indispensable factor in European children’s
E. North American children can learn to eat a more nutritious diet as well as to exercise daily.
參考答案：D
A为什么不行呢？
我的理解是， 要欧洲的那套也符合美国孩子才行，就是说所有人都可以通过健美操而提高身体素质。
"all"这个绝对词的概念在原文里面并没有提到,这里强调的是calisthenics增强体质的可
能性而非绝对性.
Conclustion的关键词是"only if", 只有当北美儿童每天参加健美操课程时才有可能保持体型
,当"only if"出现时,"indispensible"这个遥相呼应的关键词便在选项D里面呼之欲出了.
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