单项选择题
A.ratio
B.proportion
C.rate
D.percentage
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单项选择题
A.scopeB.durationC.spanD.stretch
A.scope
B.duration
C.span
D.stretch
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单项选择题
A.scarceB.rareC.unusualD.precious
A.scarce
B.rare
C.unusual
D.precious
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