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 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
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