21世纪，综合国力竞争成败的关键是[ ] A．一个国家工业经济

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问题选择题

21世纪，综合国力竞争成败的关键是[ ]

A．一个国家工业经济发达程度的高低

B．一个国家农业经济发达程度的高低

C．一个国家知识经济发达程度的高低

D．一个国家第三产业经济发达程度的高低

答案

答案：C

选择题

No sooner ________ themselves in their seats in the theatre _______ the curtain went up.

A．they have settled; before

B．had they settled; than

C．have they settled; when

D．they had settled; than

单项选择题

一足月儿，生后喂奶即出现呛咳及呕吐，X胸片示两肺不张，腹部平片示胃无气体。最可能的诊断为：（）

A.膈疝

B.十二指肠闭锁

C.食管闭锁

D.食管裂孔疝

E.双侧后鼻孔闭锁