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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.


答案d,求指教

sdcar2010

Necessary assumption. Use negation.

If you negate D), you have:
School calisthenics are NOT an in indispensable factor in European children’s superior physical fitness.
If this is the case, then school calisthenics is not a necessary factor in European's superior physical fitness.  Likewise, the school calisthenics is not a necessary factor in American children's physical fitness. The conclusion of the passage falls apart.  Thus, D) is the correct answer.

zxppx

3.     In Europe, schoolchildren devote time during each school day to calisthenics. North American schools rarely offer a daily calisthenics program. Tests prove that North American 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.
文中说的是NA的孩子，而不是all children，扩大了范围
(B)  All children can be made equally physically fit by daily calisthenics.
文中没有说NA一定要和E的孩子一样physically fit，而是只要NA的孩子能够physically fit就可以
(C) Superior physical fitness produces superior health.
(D) School calisthenics are an indispensable factor in European children’s superior physical fitness.
“取非”，即欧洲孩子不只是依靠健美体操课来获得好的身体素质，还依靠其他的因素，那么如果NA只是让孩子参与calisthenics，就无法满足其他因素，也就不能实现目标physical fitness，削弱结论（D）
(E) North American children can learn to eat a more nutritious diet as well as to exercise daily.