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
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单项选择题
Although Mr. Green's style is more approachable than his predecessor's, close observers reckon his ________is just as strong.
A．textile
B．substance
C．material
D．particle
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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