单项选择题

The phrase "even in winter" (in line 8) most nearly means ______.

A．if the winter is especially warm
B．during all of the year except the winter
C．in the winter as well as in other seasons
D．during the evenings in the winter

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单项选择题

Until recently, body heat has caused problems because it ______.

A．was difficult to collect
B．came in a variety of forms
C．was difficult to get rid of
D．tended to be absorbed by physical objects

单项选择题

The phrase heat recovery refers to a ______.

A．method of concealing the source of heat
B．special form of air conditioning
C．supplementary hot water system
D．way of reclaiming and re—using heat