单项选择题

The passage suggests that the author' s heat-pump system absorbs heat from ______.

A．soil in a nearby field
B．sun panels at ground level
C．a pipe buried next to the walls
D．a tank of propylene glycol
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单项选择题
One benefit the author mentions is that the system______.
A．uses no electricity
B．has a fire-safety shutoff
C．does not pollute the air in the house
D．pollute the air in house
单项选择题
One of the reasons for the current crisis in American colleges and universities is that______.
A．a narrow vocationalism has come to dominate many colleges
B．students don' t have enough freedom in choosing what they want to learn
C．skills are being taught as a means to an end
D．students are only interested in obtaining credentials
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