单项选择题

According to the passage, the author's heat pump requires ______

A．no maintenance
B．very little maintenance
C．only a yearly check of controls
D．no more maintenance than an oil burner
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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．How to Know Whether an Oil Burner is Right for Your Home
D．The Ground-Source Heat Pump: It Works for Me!
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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