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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  37
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 text implies that
选项 A、some sounds are joyful and necessary, while others are not.
B、noise is likely to give rise to low blood pressure.
C、our inner ear is vulnerable to listen to the pop music.
D、beautiful background music can help us concentrate on tasks.
答案A
解析 文章前两段说声音是我们生活中必不可少的以及声音的种种好处。后九段说声音，主要是噪音对健康的种种影响。由此可推知，选项A正确。根据第四段第三句“。Noise can also raise blood pressure，putting strain on the heart．”可见噪音会引起高血压，而和低血压没有关系，故B项错误。根据原文第三段第三句“However…the sounds that ale too loud…”可知，音量太高的音乐或者持续太久的高音会影响我们的听力，文中没有涉及流行音乐会影响听
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