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.
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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
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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