单项选择题

The author's attitude toward the invention of snow houses by Eskimos is ______

A．impartial
B．admiring
C．sympathetic
D．critical
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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
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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