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  3. Nobody can be really free from the sound. Whether we live in the middle of a modern city or a faraway village, we are surrounded

Nobody can be really free from the sound. Whether we live in the middle of a modern city or a faraway village, we are surrounded

admin2011-02-08  74
问题     Nobody can be really free from the sound. Whether we live in the middle of a modern city or a faraway village, we are surrounded by sound every day such as the sounds from television and radio, household appliances, and traffic. Sound makes up a part of our life.
    In fact, most of us can not bear total silence. Sound gives us a sense of safety and brings us joy. Scientific tests have also proved that total silence is a very frightening experience for human beings. A recent report shows that people feel quite lonely without background sound while they are working. The background sound which doesn’t change too much may even help people to concentrate.
    However, sometimes, sound is not helpful and joyful in people’s life. Normally, we hear these sounds at safe levels that do not affect our hearing. However, when we are exposed to harmful noise—the sounds that are too loud or loud sounds that last a long time, sensitive structures in our inner ear can be damaged, causing hearing loss.
    Besides, unpleasant sounds, particularly sudden and uneven ones, may cause fear and anger. Noise is a source of stress, which can lead to tiredness, irritability and headaches. Noise can also raise blood pressure, putting strain on the heart. People living in homes exposed to high levels of road-traffic noise were more likely to report having hypertension, according to a study in Environmental Health. The researchers estimate the noise levels for the addresses of more than 24, 000 Swedish. They found that people exposed to an average traffic-noise level above 64 decibels (slightly louder than a normal conversation) were 52% more likely than people exposed to 45 decibels of road noise to report having high blood pressure, a key risk factor for heart disease, after removing age, socioeconomic status, and other variables. Noise exposure could cause hypertension by persistently elevating the body’s level of stress hormones.
    Now we know that noise is harmful to our health, but can we get used to the excessive noise? The answer is NO. If, after long exposure to excessive noise, we stop hearing it — because we have become deaf!
The author writes this passage to
选项 A、tell us the knowledge of sound.
B、compare sound with noise.
C、show the hazard of noise.
D、warn the noise damage.
答案D
解析 纵观全文，文中首先说明声音对人们生活的积极作用，然后重点讲述了噪音给人们带来的危害，并在最后一段强调虽然声音息息相关，但我们不得不预防噪音给我们身体造成的危害，因此作者此文的目的是警示人们小心噪音伤害。选择D项。
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