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
According to the passage, the author's attitude to unemployment is that ______
A．the individuals were to blame
B．the loss of overseas trade was to blame
C．the unemployed cannot understand why
D．it was not the individual's fault
单项选择题
The passage suggests that about a quarter of the tramps and beggars the author met were______
A．cynical parasites
B．like animals in a trap
C．once good at mining
D．young people
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