单项选择题

National interest is a ______ concern for all the countries.

A．consistent
B．insistent
C．persistent
D．resistant
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单项选择题
He can't be a driver; the colorblindness .deprived him of the ability to make a ______ between red and green.
A．comparison
B．division
C．distinction
D．difference
单项选择题
Nobel was happy when together with others, and often felt very lonely ______.
A．by himself
B．in person
C．in private
D．as individual
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