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
To impress a future employer, One should dress neatly, be ______ , and display interest in the job.
A．swift
B．instant
C．timely
D．punctual
单项选择题
The English weather defies forecast and hence is a source of interest and ______ to everyone.
A．speculation
B．attribution
C．utilization
D．proposition
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