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问题 单项选择题

小剂量氯丙嗪即有镇吐作用，其作用部位是：

A．直接抑制延脑呕吐中枢

B．抑制大脑皮层

C．阻断胃粘膜感受器的冲动传递

D．抑制中枢胆碱能神经

E．阻断延脑催吐化学感受器的D2受体

答案

参考答案：E

选择题

The film is very moving. I _____ it twice already.    [ ]

A. will see

B. see    

C. saw

D. have seen
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选择题

— Hi, Tom．Any idea where Mary is? ．

一 She　______in the reading room．I saw her there just now．

A．shall be

B．should have been

C．should be

D．might have been
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