单项选择题

Old Mr. Brown's condition looks very serious and it is doubtful if he will______.

A．pull through
B．pull up
C．pull back
D．pull out
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单项选择题
In New York there is a shifting population of vagrants usually with an unhealthy______ for alcohol
A．attitude
B．aptitude
C．appetite
D．altitude
单项选择题
Poor health and lack of money may both be ______to educational progress.
A．restraints
B．stains
C．scarcities
D．barriers
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