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】
[解析] stem from源于。flow流动，循环；come来；derive得到；originate源自，来自。故答案为D。
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