2. 外语
  3. The primary purpose of the passage is to ______. It can be inferred from the passage that, in the course of a heating season, t

The primary purpose of the passage is to ______. It can be inferred from the passage that, in the course of a heating season, t

admin2009-06-15  58
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 heating capacity of a 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 由文章第五段可知，要使热力泵达到最大供热能力的条件是：外界空气温度达到最高点。而外界气温越高，人们越不需要热力泵供热，因此A项是正确答案。
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