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
According to the author, the building of the snow house was necessary because of ______
A．the inhabitants' lack of ability and industry
B．the extreme cold temperatures
C．the large expense involved in shipping raw materials to the Arctic Circle
D．the surroundings, which restrict any building to what is essential
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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