单项选择题

______ man must fear when traveling in space is radiation from the sun.

A．Which
B．How
C．What
D．That
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单项选择题
When it was clear ______ she did not speak a word of English, I tried to talk to her using the Spanish I learned while living in Europe.
A．what
B．that
C．why
D．how
单项选择题
______ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.
A．As
B．With
C．Once
D．While
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