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To those who smoke, however, they can be important in increa......

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A．The noise in the library.B．The crowded room.C．The heat in the office.D．The disturbed sleep.
A．The noise in the library.
B．The crowded room.
C．The heat in the office.
D．The disturbed sleep.
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Although chronic irritation from certain chemical substances, radiation, viruses, occupational hazards, air pollution, and other environmental factors have been implicated in this disease
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