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
The best title for the passage is ______.
A．Preparing the Ground for a Pump System
B．Pros and Cons of the Ground-Source Heat Pump
C．The Ground-Source Heat Pump
D．It Works for Me!
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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