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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单项选择题
__________ care in hospitals should be given to those who are seriously ill.
A．Extensive
B．Extreme
C．Generous
D．Intensive
单项选择题
The carpet __________ easily, so try not to spill anything on it.
A．spots
B．marks
C．stains
D．patches
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