单项选择题


A．valuable
B．significent
C．commercial
D．effective
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单项选择题
A．efficiencyB．energyC．timeD．money
A．efficiency
B．energy
C．time
D．money
单项选择题
A．measuresB．measuredC．is measuredD．was measured
A．measures
B．measured
C．is measured
D．was measured
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