单项选择题

（）man must fear when traveling in space is radiation(辐射) from the sun.

A．Which
B．How
C．What
D．That

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单项选择题
Preparations are being made for the Olympic Games（）in Beijing in 2008.

A．held
B．holding
C．to hold
D．to be held
单项选择题
（）for your advice, we'd never have been able to overcome the difficulties.

A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
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