单项选择题

The car comes with a heater but the air conditioning is __________.

A．excessive
B．additional
C．optional
D．arbitrary
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单项选择题
The gross national product __________ one percent by the same time of last year.
A．condensed
B．slimmed
C．dissolved
D．shrank
单项选择题
However many of the considerations which apply to small utility boilers are directly applica ble __________ large industrial boilers.
A．for
B．on
C．to
D．into
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