单项选择题

If the diver is in deep water, he must come to the surface in order to allow his body to ______ to the change in pressure.

A．modify
B．adopt
C．improve
D．adjust
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单项选择题
The frontier guards will shoot ______ anybody trying to cross the boundary.
A．at
B．to
C．toward
D．in
单项选择题
Since my childhood I have been always taught that it is very ______ to interrupt others.
A．rude
B．rough
C．crude
D．coarse
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