单项选择题

A. result of nuclear explosion, fallout is the descent of minute particles of radioactive material through the atmosphere.A. charged
B. heavy
C. tiny
D. lost
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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
Scott seized the opportunity to present his proposal to the director.
A. realized
B. grasped
C. rendered
D. delivered
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