单项选择题

A．New York University
B．Columbia University in New York
C．Washington University
D．Harvard University
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单项选择题
A．100.B．35.C．1,200.D．1,000.
A．100.
B．35.
C．1,200.
D．1,000.
单项选择题
A．eliminating all excessive and unnecessary noiseB．where industrial noise comes fromC．how to protect yourselves from being hurt by noiseD．how to complain when you suffer traffic noise
A．eliminating all excessive and unnecessary noise
B．where industrial noise comes from
C．how to protect yourselves from being hurt by noise
D．how to complain when you suffer traffic noise
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