合剂与口服液最常用的净化方法为（）
A.液-固萃取
B.液-液萃取
C.蒸馏法
D.沉淀法
E.升华法
参考答案：B
It is reported that many a new house _____ at present in the disaster area. [ ]
A. are being built
B. were being built
C. was being built
D. is being built
时针走一大格，相当于分针走一圈。[ ]
