Of many health hazards to noise， hearing loss is the most clearly observable and measurable by health professionals. The other hazards are harder to pin down. For many of us， there may be a risk that exposure to the stress of noise increases susceptibility to disease and infection. The more susceptible among us may experience noise as a complicating factor in heart problems and other diseases. Noise that causes annoyance and irritability in health persons may have serious consequences for these already ill in mind or body.

　　Noise affects us throughout our lives. For example， there are indications of effects on the unborn child when mothers are exposed to industrial and environmental noise. During infancy and childhood， youngsters exposed to high noise levels may have trouble falling asleep and obtaining necessary amounts of rest.

　　Why， then， is there not greater alarm about these dangers? Perhaps it is because the link between noise and many disabilities or diseases has not yet been conclusively demonstrated. Perhaps it is because we tend to dismiss annoyance as a price to pay for living in the modern world. It may also be because we still think of hearing loss as only an occupational hazard.

　　1.In Paragraph 1， the phrase immune to are used to mean ___.

　　A.unaffected by

　　B.hurt by

　　C.unlikely to be seen by

　　D.unknown by

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