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
A group of angry parents had __________ outside the head teacher's office.
A．assembled
B．accumulated
C．piled
D．joined
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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