单项选择题

All experts agree that the most important consideration with diet drugs is carefully______ the risks and benefits.

A．weighing
B．valuing
C．evaluating
D．distinguishing
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单项选择题
The effect of doubling the width of a beam,______ is to double the load that can be sustained.
A．other factors remain constant
B．other factors remained constant
C．the other factor being constant
D．other factors remaining constant
单项选择题
I have offered a prediction that the reforms run a very high risk of being______ by a general collapse of confidence in the ruble.
A．set back
B．let down
C．hold back
D．run down
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