单项选择题

A．Because they have had little exposure to high level of sounds.
B．Because they suffer from hearing loss.
C．Because they don’t know how to operate stereo systems.
D．Because they are not qualified engineers.
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单项选择题
A．Barry no longer lives in New York.B．Barry doesn’t know how to be economical.C．The woman called Barry in California.D．The woman didn’t ever meet Barry.
A．Barry no longer lives in New York.
B．Barry doesn’t know how to be economical.
C．The woman called Barry in California.
D．The woman didn’t ever meet Barry.
单项选择题
A．The heart disease.B．Cancer.C．Accidents.D．Medical Accidents.
A．The heart disease.
B．Cancer.
C．Accidents.
D．Medical Accidents.
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