单项选择题

The recycling of aluminum conserves ninety-five percent of the energy needed to make new metal.

A. cleaning
B. reprocessing
C. reselling
D. crushing
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单项选择题
Color changes in chameleons seem to be caused by environmental temperature as well as by other external stimuli.
A. ought
B. have
C. appear
D. used
单项选择题
The Social Insurance Number(SIN) card is the primary mode of identification for Canadians.
A. principal
B. original
C. prior
D. sole
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