单项选择题

Which of the following is true of the heating system of the Johnstown campus（）

A．The heat is supplied by human bodies only.
B．The heat is supplied by both human bodies and other heatemitting objects.
C．The heat is supplied by both human bodies and conventional fuel.
D．The heat is supplied by human bodies, other heatemitting objects, and conventional fuel.

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单项选择题

According to the passage which of the following would produce the LEAST amount of heat（）

A．A fat female who studies hard.
B．A thin female who does not study.
C．A fat male who does not study.
D．A thin male who studies har

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