单项选择题

The walrus uses its tusks to dig food from the ocean bottom.

A. floor
B. environment
C. islands
D. waves
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One out of five American children suffers from dyslexi
A． RightB. WrongC. Not mentioned
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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