单项选择题
A.discovered
B.delivered
C.launched
D.transmitted
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单项选择题
A.WhileB.SinceC.BecauseD.Suppose
A.While
B.Since
C.Because
D.Suppose
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单项选择题
A.percentageB.proportionC.rateD.ratio
A.percentage
B.proportion
C.rate
D.ratio
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