单项选择题

Poor health and lack of money may both be ______ to educational progress.

A．scarcities
B．stains
C．restraints
D．barriers
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单项选择题
As he failed to win the first prize in the badminton match, he had to ______ the second.
A．settle in
B．settle for
C．settle up
D．settle with
单项选择题
A series of strikes have ______ many of the basic industries in that country.
A．crippled
B．damaged
C．changed
D．decreased
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