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
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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.
单项选择题
What is the main subject of the passage
A．Bussiness management policies.
B．Driving to work.
C．Extending the work place by means of computers.
D．Computers for child—care purposes.
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