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
Margaret Avison, one of Canada's finest poets, has remained outside the mainstream of recognized writers.
A．thrived
B．stayed
C．reappeared
D．published
单项选择题
A result of nuclear explosion,fallout is the descent of minute particles of radioactive materiaI through the atmosphere.
A．charged
B．heavy
C．tiny
D．lost
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