单项选择题

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

A．restraints
B．stains
C．scarcities
D．barriers
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The scientists began to accumulate dat
A． collectB. handleC. analyzeD. investigate
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The clothes a person wears may express his standing or social position.
A．curiosity
B．status
C．determination
D．significance
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