单项选择题

Though the committee members have tried their best to tackle the problem, they ended up failing to find an appropriate________.

A．result
B．response
C．settlement
D．solution
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单项选择题
The purpose of the simulation is to estimate mean vehicle queue lengths and delays for various vehicle ________and train frequencies.
A．popularity
B．densities
C．intensities
D．prosperity
单项选择题
It doesn't come as a surprise to you to realize that it makes no ________what you read or study if you can't remember it.
A．variation
B．separation
C．difference
D．contradiction
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