单项选择题

Every member of society has to make a______ to struggle for the freedom of the country.

A．pledge
B．warranty
C．petition
D．guarantee
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单项选择题
He is too young to be able to______ between right and wrong.
A．distract
B．discern
C．disperse
D．disregard
单项选择题
As was estimated in 1997, .total telephone sets now in use in the United Stated numbered 170 millions. With so many sets______ into a system, efficiency is a major concern.
A．compiled
B．knitted
C．integrated
D．elapsed
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