能平补阴阳的药是（）
A.党参
B.山药
C.黄精
D.山茱萸
E.鹿茸
参考答案：B, C, D
若串s="MathTypes"，则其子串的数目是【 】。
There is ______ in today's CCTV news. [ ]
A. important something
B. important nothing
C. something important
D. anything important
