单项选择题

It is important to ______ between the rules of grammar and the conventions of written language.

A．determine
B．distinguish
C．identify
D．explore
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单项选择题
According to the periodic table, ______ still some elements undiscovered.
A．there seem to be
B．it seems to be
C．it seems that
D．here seem
单项选择题
A ______ change in policy is needed if relations are ever to improve.
A．strict
B．wide
C．ever
D．radical
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