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标题: feifei 131求助！！！ [打印本页]

作者: hgconnie 时间: 2007-1-23 16:55
标题: feifei 131求助！！！

131. To become an expert on a musical instrument, a person must practice. If a person practice a musical instrument for three hours each day, they will eventually become expert on that instrument. Therefore, if a person is an expert on a musical instrument, that person must have practiced for at least three hours each day.

Which one of the following most accurately describes a flaw in the reasoning above?

(A) The conclusion fails to take into account that people who practice for three hours every day might not yet have reached a degree of proficiency that everyone would consider expert.

(B) The conclusion fails to take into account that practicing for less than three hours each day may be enough for some people to become experts.

(C) the conclusion fails to take into account that if a person has not practiced for at least three hours a day, the person has not become an expert.

(D) The conclusion fails to take into account that three consecutive hours of daily practice is not recommended by all music teachers.

(E) The conclusion fails to take into account that few people have the spare time necessary to devote three hours daily to practice.

答案B，我选的A。

头发涨，给绕晕了，哪个牛人来讲讲啊？

作者: latuan1982 时间: 2007-1-23 23:14
A->B, 但是B不一定能推出A
所以这里犯的错误是充分必要性
所以答案应该说的是B不一定是A的充分条件。。。
也就是说 practiced for at least 3 hours a day, 不一定能推出...must have practised 3 hours a day.

答案B就说明这个错误。。。ppl who have practised less than 3 hours a day can become experts as well.

选项A只是否定提干中的premise....，攻击方向错误。

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