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问题 选择题

12. They were astonished _____ the news of his escape from prison.

A．for

B．in

C．at

D．to

答案

答案：C

选择题
I have reached a point in my life _____ I am supposed to make decisions of my own.

A. which
B. where
C. how
D. why
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选择题

HF、H2O、CH4、SiH4四种气态氢化物按稳定性由弱到强顺序排列正确的是

A．CH4<H2O<HF<SiH4

B．SiH4< HF <CH4<H2O

C．SiH4< CH4<H2O<HF

D．H2O < CH4< HF < SiH4
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