单项选择题

The child was on the ______ of tears when his mother asked him what had happened to him.

A．verge
B．border
C．margin
D．rim
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单项选择题
Those who ______ armed intervention in the internal affairs of other countries are blindto the lessons of history.
A．advocate
B．affirm
C．avail
D．applaud
单项选择题
We should make a clear ______ between the two scientific terms for the purpose of our discussion.
A．distinction
B．discrimination
C．deviation
D．separation
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