单项选择题
The scientists began to
accumulate
data.
A.collect
B.handle
C.analyze
D.investigate
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单项选择题
A.reasonB.dutyC.necessityD.task
A.reason
B.duty
C.necessity
D.task
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单项选择题
A.affordB.decideC.hopeD.expect
A.afford
B.decide
C.hope
D.expect
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