单项选择题

He asserted that nuclear power was a safe and non-polluting energy source.

A. maintained
B. recommended
C. considered
D. acknowledged
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单项选择题
A young man is being hailed a hero tonight after rescuing two children.
A. reported
B. proved
C. caught
D. praised
单项选择题
At 80, Peck was still vigorous and living in Paris.
A. happy
B. energetic
C. alone
D. busy
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