单项选择题

The following factors have been added to the corrosive force of the river EXCEPT ______.

A．rain
B．snow
C．heat
D．wind
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单项选择题
The word meandered in Line 4, Paragraph 3 is closest in meaning to ______.
A．flowed
B．lulled
C．moved
D．winded
单项选择题
If one wants to work more efficiently at his low point in the morning, he should ______.
A．change his energy cycle
B．overcome his laziness
C．get up earlier than usual
D．go to bed earlier
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