得，这个答案不只抽象，还得推理。。。。

来源: yuriko6911 于 2010-05-29 07:23:28 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.