单项选择题

Some fish have a greater _______ for acid water than others.

A．tolerance
B．resistance
C．dependence
D．persistence
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单项选择题
A 1994 World Bank report concluded that _______ girls in school was probably the single most ef- fective anti- poverty policy in the developing world today.
A．involving
B．enrolling
C．assigning
D．admitting
单项选择题
There is supposed to be a safety _______ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
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