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

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

选项 A、flows
B、comes
C、derives
D、originates

答案D

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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