单项选择题

A brisk walk in cool weather is invigorating.

A．short
B．long
C．lively
D．solemn
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单项选择题
Gerald was absolutely certain of its veracity.
A．partially
B．supposedly
C．completely
D．moderately
单项选择题
Pollutants introduced into a lake can rapidly accelerate its natural aging process.
A．change
B．speed up
C．turn around
D．destroy
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