-What's this in English?
-________ a book. [ ]
A.This is
B.This's
C.It's
答案：C
—How often do you call your parents?
—______, but usually once a week.
A．Forget it
B．Once in a while
C．It depends
D．I’ve no idea
患者，男，40岁。心悸失眠，大便秘结，口干，舌红，脉细数。用药宜首选（）
A.酸枣仁
B.柏子仁
C.远志
D.合欢皮
E.朱砂
