单项选择题

Be sure not to _______ his help. Do it all by yourself.

A．account for
B．press for
C．call on
D．reckon on
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单项选择题
Some fish have a greater _______ for acid water than others.
A．tolerance
B．resistance
C．dependence
D．persistence
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
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