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'
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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
单项选择题
If the author's assessment of the use of heat pumps is correct, which of the following best expresses the les,son that advertisers should learn from this case
A．Do not make exaggerated claims about the products you are trying to promote.
B．Focus your advertising campaign on vague analogies and veiled implications instead of on facts.
C．Do not use facts in your advertising that will strain the prospective client's ability to believe.
D．Do not assume in your advertising that the prospective clients know even the most elementary scientific principles.
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