单项选择题

Urban ______ could no doubt be relieved somewhat by a reduction in public transport fares.

A．jamming
B．congestion
C．accumulation
D．blockage
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单项选择题
When one thing in motion hits another thing, it ______ with it.
A．coincides
B．collides
C．reconciles
D．converges
单项选择题
When a body is ______ in a fluid it apparently loses weight.
A．displaced
B．indulged
C．dispersed
D．immersed
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