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问题 单项选择题

肠结核的好发部位是

A．升结肠
B．回盲部
C．空肠
D．横结肠
E．状结肠

答案

参考答案：B

选择题
The two friends ____ on the Internet for three hours, and they would go on till the next morning.

A. had been chatting
B. had chatted
C. were chatting
D. have been chatting
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单项选择题

对应于50年设计基准期内超越概率为2%～3%的地震烈度称为（）。

A.多遇地震烈度 

B.罕遇地震烈度 

C.小震烈度 

D.众值烈度
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