5-2-3

番茄炒蛋

5-2-3
.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.

(B) All children can be made equally physically fit by daily calisthenics.

(C) Superior physical fitness produces superior health.

(D) School calisthenics are an indispensable factor in European children’s superior physical fitness.

(E) North American children can learn to eat a more nutritious diet as well as to exercise daily
答案是d
这题我开始选a，既然原文说想通过什么calist 来提高小孩的能力，那么起码这些小孩是要有可能提高的咯 。就想一个小猪，想要通过训练让它飞上天总是不可能的吧。
但后来一想，估计是我把only if的那个必要条件当作了充分条件来看了，来个兄弟帮我确认一下吧，我是不是栽在这个坑里了？

yhcui

我看这道题时首先就排除了a,b，因为原文中只说了E和NA的小孩，但并没说他们能代表全体小孩--这中间有个人推理--就像你说的“就想一个小猪，想要通过训练让它飞上天总是不可能的吧。”道理时对的，但原文没说，我怎么知道呢？---避免读题、解题过程中自己推理

而D恰恰就是排除了E小孩棒的其他可能原因。。

我这样想：）

番茄炒蛋

谢谢小cui，a的打击面是太广了一些
这题的only if我算是搞懂了，呵呵，谢