欲从中药材中提取双糖苷，一般可用()
A．冷水浸渍
B．70％乙醇回流
C．苯回流
D．酸性乙醇浸渍
E．酸性乙醇回流
参考答案：B
.It was the practice _____ he got abroad _____ made him a good English speaker.
A．what; that
B．that; that
C．that; which
D．which; that
《廉政准则》规定，不准违反规定决定或者批准用公款或者通过摊派方式举办各类（）活动。
A.开工
B.开业
C.庆典
D.座谈
