单项选择题


A．tries to cover
B．manages to cover
C．fails to cover
D．succeeds in
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单项选择题
A．HoweverB．AndC．ThereforeD．So
A．However
B．And
C．Therefore
D．So
单项选择题
A．valueB．ratioC．rateD．speed
A．value
B．ratio
C．rate
D．speed
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