题目内容
（请给出正确答案）
[主观题]
What conclusion can we make based on the whole passage？A．Heat pumps are not efficient in s
What conclusion can we make based on the whole passage？
A．Heat pumps are not efficient in supplying heat in coldness.
B．Heat pumps can find applications everywhere.
C．Heat pumps are of no use at all.
D．The inner structure of a heat pump is so complex that it has already been out of date.
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