单选题
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.
【正确答案】
B
【答案解析】
答案在第一段的第三句中。他们设计了一种收集系统，它不但利用身体的热，还收集由灯泡、冰箱等散发出来的热。有了这两种热能，作者指出在校园中已无需任何conventional fuel
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