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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单项选择题
The Faraday effect was the first demonstration of a connection between magnetism and light.
A. questioning

B. proof
C. achievement

D. symbol
单项选择题
Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.()

A. sufficiently
B. noticeably
C. intentionally
D. absolutely
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