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
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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
单项选择题
Which of the following does the author mention as a possible disadvantage of telecommuting
A．Small children cannot understand the boundaries of work and play.
B．Computer technology is never advanced enough to accommodate the needs of every situation.
C．Electrical malfunctions can destroy a project.
D．The worker often does not have all the needed resources at home.
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