单项选择题

It is very useful and almost exact first approximation, valid to the situation in which we apply _________it.

A．for
B．to
C．on
D．from
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单项选择题
They are well_________ with each other since they once studied in the same university.
A．recognized
B．accustomed
C．informed
D．acquainted
单项选择题
They believed that this was not the _________of their campaign for equality but merely the beginning.
A．climax
B．summit
C．minimum
D．maximum
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