一道PREP题，马上考试了，请大家帮忙

jerryye · 发表于 2009-3-25 20:37:00

On her way home from work, Janet drives through several tollbooths. Is there a pair of these tollbooths that are less than 10 miles apart?

(1) The first tollbooth and the last tollbooth are 25 miles apart.

(2) Janet drives through 4 tollbooths on her way home from work.

答案是C，可是没有说average呀，为什么可以？

yunnan1990 · 发表于 2009-3-25 21:08:00

4个tollbooth之间，有三个空隙，倘若三个空隙距离都大于或等于10miles的话，那第一个和最后一个之间的距离至少是30miles，所以如果是25的话，那么必然有两个之间是小于10的。

jerryye · 发表于 2009-3-25 23:05:00

我明白了，不知为什么，我看成at least

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