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问题 单项选择题 B1型题

以根、根茎、种子、果实等为主的饮片，在煎药时可浸泡的时间是（）

A.5～10min

B.10～15min

C.20～30min

D.30～60min

E.60min

答案

参考答案：D

选择题

This is ____ most wonderful film, but it isn't ____ most wonderful film I have ever seen. [ ]

A. a; a

B. the; the

C. a; the

D. the; a

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选择题

计算（C2）n．（Cn+1）2的结果是

[ ]

A.C4n+4

B.C4n+2

C.C2n+2

D.C3n+4
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