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1The primary purpose of the text is to A.explain the differences in the working of a heat pump when the outdoor temperature changesB.contrast the heating and the cooling modes of heat pumpsC.describe heat pumps, their use, and factors affecting their use.D.advocate the more widespread use of heat pumps 参考答案： C 这是一道中心主旨题。本文的第二、三、四段描述了“heat pumps”的相关物理原理，第一、五、六段谈到了影响“heat pumps”应用的原因。由此可见本题的正确选项应该是C。考生在解题时一定要对全文的整体结构有所认识，并将各段的主题句联系起来加以理解。----------------------------------------2The author resolves the question of whether heat pumps run counter to the principle of energy conservation by A.carefully qualifying the meaning of that principle.B.pointing out a factual effort in the statement that gives rise to this questionC. supplying additional relevant factsD.denying the relevance of that principle to heat pumps 参考答案： C 这是一道段落间关系题。通过题干中的“the question of whether heat pumps run counter to the principle of energy conservation”可迅速确定本题的答案信息来源应该在第二段，因为第一段就是本题的题干。通过仔细阅读原文可发现本题的答案信息来源在第二、三、四段，在这三段中本文作者为解决相关问题给出了“relevant facts”（相关事实）。可见本题的正确选项应该是C。考生在解题时一定要注意段落之间的相互关系。----------------------------------------3It can be inferred from the text that, in the course of a heating season, the heating capacity of a heat pump is greatest when A.heating is least essentialB.electricity rates are lowestC.its compressor runs the fastestD.outdoor temperatures hold steady. 参考答案： A 这是一道审题定位与反推题。通过本题题干中的“heating season”可迅速将本题的答案信息来源确定在尾段，因为尾段中的“extremely cold climates”暗示出“heating season”。通过仔细阅读和理解尾段并且进行相应的推导就可得出本题的正确选项A。考生在解题时首先要具备审题定位的能力，另外在解题时不能仅仅停留于字面含义，要多动脑子进行合理的推导。----------------------------------------4If the author’s assessment of the use of heat pumps (lines 1-4) is cor
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