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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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
单项选择题
Engineers use the principles of aerodynamics in designing airplanes and other objects affected by aerodynamic forces.
A. laws
B. movements
C. studies
D. products
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