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
A friendship may be ______, casual, situational, or deep and lasting.
A．identical
B．original
C．superficial
D．critical
单项选择题
Having finished their morning work, the clerks stood up behind their desks, ______ themselves.
A．expanding
B．stretching
C．prolonging
D．extending
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