单项选择题

The police have asked for the （）of the public in tracing the whereabouts of the missing child.

A．award
B．cooperation
C．position
D．helpfulness

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单项选择题

The very biggest and most murderous wars during the industrial age were intraindustrial-wars that （）Second Wave nations like Germany and Britain against one another

A. pitted
B. drove
C. kept
D. embarked

单项选择题

All specialists agree that the most important consideration with diet drugs is carefully（）the risks and benefits．

A．valuing
B．evaluating
C．estimating
D．weighing

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