4.

　　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.

　　5.

　　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.

　　A. Noise affects us from birth even embryo(胚胎) to death.

　　B. Less attention to more unnoticeable and serious hazards in spite of the most common annoyance caused by noise.

　　C. The reasons for there being no greater alarm about these dangers.

　　D. Noise is more a real and present danger than a nuisance to people’s health.

　　E. How much do we know about annoyance caused by noise?

　　F. How much do we know about the possible hazards to people’s health caused by noise?

　　参考答案基础操练

　　Ⅰ.1-5.B D C B A

　　Ⅱ. 1. accountant 2. encounter 3. temporary 4. qualified 5. essential 6. personalities

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