多项选择题

细菌性食物中毒的流行病学特点包括( )

A.无明显季节性
B.发病率高
C.病程短、恢复快
D.中毒食品主要为动物性食品
E.病死率低
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单项选择题

Must I take a taxi? – No, you () . You can ta

A.had better to
B.don’t
C.must not
D.don’t have to

单项选择题

Mary’s brother had a talk at school yesterday afternoon, ()he?

A.had
B.hadn’t
B.did
D.didn’t

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Excuse me, is this the Sale’s Department?()

A.I’m afraid you have the wrong number.
B.You are wrong.
C.What’s wrong with you?
D.What are you talking about?