单项选择题

Urban crowdedness would be greatly relieved if only the ______ charged on public transport were more reasonable.

A．fees
B．fares
C．payments
D．costs
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单项选择题
Vitamins are complex ______ that the body requires in very small mounts.
A．matters
B．materials
C．particles
D．substances
单项选择题
Not having a good command of English can be a serious ______ preventing you from achieving your goals.
A．obstacle
B．fault
C．offense
D．distress
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