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
Which of the following is NOT commonly available for building houses in the Arctic Circle
A．Stone.
B．Animal bones.
C．Timber.
D．Snow and ice.
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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