单项选择题

The author regards the notion that heat pumps have a genuine drawback as a ________.

A．cause for regret
B．sign of premature defeatism
C．welcome challenge
D．focus for an educational campaign
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单项选择题
It can be inferred from the passage that, in the course of a heating season, the heating capacity of a heat pump is greatest when ________.
A．heating is least essential
B．electricity rates are lowest
C．its compressor runs the fastest
D．outdoor temperatures hold steady'
单项选择题
The primary purpose of the passage is to ________.
A．explain the differences in the working of a heat pump when the outdoor temperature changes
B．contrast the heating and the cooling modes of heat pumps
C．describe heat pumps, their use, and factors affecting their use
D．advocate the more widespread use of heat pumps
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