It is reported that two schools,       are being built in my hometown, will open next year.    [ ]

A. they both      

B. which both    

C. both of them    

D.both of which

父系氏族逐渐取代母系氏族的根本原因是[ ]

A．妇女在采集和家务劳动中失去地位

B．男子在犁耕农业和畜牧业中占主导地位

C．由群婚到婚姻关系的相对稳定

D．生产力的提高