CA索引包括（）
A.著者索引
B.分子式索引
C.专利索引
D.属类索引
E.累积索引
参考答案：A, B, C, E
E-mail, as well as telephones, ______ an important part in daily communication.
A．is playing
B．have played
C．are playing
D．play
朱砂安神丸的药物组成有
A.玄参
B.丹参
C.黄连
D.木通
E.竹叶
