美国的三年级数学，相当于国内的一年级程度

来源: lisi 于 2016-10-20 06:48:13 [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.

Change Ad Consent