单项选择题

It is not clear whether the increase in reports is stemmed from greater human activity or is simply the result of more surveys.

A. flows
B. comes
C. derives
D. originates
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单项选择题
The temperatures are somewhat lower than the average temperature in May this year.
A. rather
B. very
C. a little
D. less
单项选择题
To tell you the truth, I did extract several passages from the speech when writing my speech.
A. take out
B. take off
C. take on
D. take up
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