单选题
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
【正确答案】
D
【答案解析】
flow流淌；come来；obtain获得；originate源于。因为stem原意是指“茎”，stem from意为“根源于”，故选D项。
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