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
A teacher should not show ______ for any one of his pupils.
A．profession
B．preference
C．priority
D．prosperity
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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