单项选择题

A．Brazil.
B．Argentina.
C．Chile.
D．Ecuador.
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单项选择题
A．Rock music might help improve your math test scores.B．The effects of music on tests do not last long.C．Listen to music just before you take a test.D．The more you listen to music, the better your reasoning ability will be.
A．Rock music might help improve your math test scores.
B．The effects of music on tests do not last long.
C．Listen to music just before you take a test.
D．The more you listen to music, the better your reasoning ability will be.
单项选择题
Alcohol can serve as a sedative, so it can be used to improve your sleep.
A．Y
B．N
C．NG
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