陈向东逻辑-归纳一题-宿舍的安全通道问题

evelyn205205 · 发表于 2011-7-6 14:03:42

Dormitories range from two to six stories in height. If a dormitory room is above the second floor, it has a fire escape. If the statements above are true, which of the following must also be true?

A. Second-floor dorm rooms do not have fire escapes.

B. Third-floor dorm rooms do not have fire escapes.

C. Only dormitory rooms above the second floor have fire escapes.

D. 4th floor dormitory rooms have fire escapes.

E. Some two-story dormitories do not have fire escapes.

答案是D。我赞同。
可是一开始我选的不是D，而是A，不理解为什么A不对。
既然，2楼以上即三楼及三楼以上才有安全通道，那么2楼就是没有安全通道的么，这样的理解有问题么？
还请各位高手来帮忙，thanks in advance。

Kb24 · 发表于 2011-7-6 14:20:17

2楼以上有fire escape，不能直接推出2楼或者以下没有fire escape. 所以A不对。原句没有说only the rooms above the second floor have a fire escape.
供LZ参考

evelyn205205 · 发表于 2011-7-6 16:24:44

谢谢你的解释！

陈向东逻辑-归纳一题-宿舍的安全通道问题

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