单项选择题

You don't have to install this radio in your new car. It's an ______ extra.

A．excessive
B．optional
C．additional
D．arbitrary
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单项选择题
I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.
A．while
B．since
C．after
D．as
单项选择题
I suggested he should ______ himself to his new conditions.
A．adapt
B．adopt
C．regulate
D．suit
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