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
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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
单项选择题
The League of Women Voters is a nonpartisan organization that promotes informed active public participation in government.
A. amateur
B. organized
C. educated
D. dedicated
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