治疗胃寒呕吐，应首选的药物是（）.
A.白芥子
B.杏仁
C.半夏
D.桔梗
E.竹茹
参考答案：C
Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry. [ ]
A. must
B. can
C. should
D. would
M3UA中，容灾用的AS是否激活是由（）决定的.
A.TG
B.SG
C.AG
D.AS
