题目

等腰三角形一腰上的中线把周长分为9cm和21cm的两部分，则这个等腰三角形的底边长是（ ） A . 2cm B . 14cm C . 18cm D . 2cm或18cm 答案：AThere are many people standing in front of the government building, __________ some are peasants. A. of them B. from whichC. who of D. of whom