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
He expressed concern that the ship might be in danger.
A. worry
B. difficulties
C. need
D. danger
单项选择题
He is always here; it' s surprised you've never met him.
A. unique
B. strange
C. rare
D. particular
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