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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