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．docs not pollute the air in the house
D．requires less insulation in house walls
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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
单项选择题
According to the passage, which of the following statements is TRUE
A．I had never mingled with tramps and beggars in my life.
B．I first became aware of the unemployment problem in 1938.
C．Young miners and cotton workers had been brought up to work.
D．Young miners could all find work if they wanted to.
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