单项选择题

Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.

A．inclined to
B．subjected to
C．prone to
D．bound to
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单项选择题
The ______ spent in unscrewing the rusty bolt left her exhausted.
A．expedition
B．execution
C．employment
D．exertion
单项选择题
The policeman ______ noted something different about the fellow' s accent.
A．undoubted
B．doubtless
C．doubtful
D．undoubting
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