单项选择题

A．value
B．ratio
C．rate
D．speed
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单项选择题
A．measuresB．measuredC．is measuredD．was measured
A．measures
B．measured
C．is measured
D．was measured
单项选择题
A．valuableB．significentC．commercialD．effective
A．valuable
B．significent
C．commercial
D．effective
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