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  3. The primary purpose, of the passage is to______ It can be inferred from the passage that, in the course of a heating season, th

The primary purpose, of the passage is to______ It can be inferred from the passage that, in the course of a heating season, th

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问题 The primary purpose, of the passage is to______
It can be inferred from the passage that, in the course of a heating season, the heatingcapacity of h heat pump is greatest when______
选项 A、heating is least essential
B、electricity rates are lowest
C、its compressor runs the fastest
D、outdoor temperatures hold steady
答案A
解析 第五段第二、四句指出，热泵的制热能力随着室外温度下降而降低。原因是：被压缩的制冷剂容量减少，通过热泵循环传送的热负荷就越少。可见，随着温度升高，加热就没有必要。
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考研英语一

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