卫生监督协管的主体是（）。

Barany's theory was declared to prove______.A．how our hearing mechanism worksB．why we constantly move our eyesC．that eye movement is affected by temperatureD．how hearing reacts

A.
A．how
B.why
C.that
D.how

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What does the author of this passage believe is the real cause of gang enrollment’（）

A．Altering political system.
B．Seeking fortune.
C．Avoiding discrimination.
D．Obtaining protection.

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