单项选择题

In his unhappiness he had come even to question his ______.

A．diversity
B．entity
C．prosperity
D．minority
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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
单项选择题
The ______ spent in unscrewing the rusty bolt left her exhausted.
A．expedition
B．execution
C．employment
D．exertion
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