单项选择题

It is not always so easy to tell the true ______. the false.

A．from
B．with
C．off
D．against
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单项选择题
If these trousers are too big, buy a smaller ______.
A．set
B．piece
C．pair
D．suit
单项选择题
The population of America is smaller than _____ of our country.
A．those
B．it
C．that
D．this
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