（二）TheMagicofSound根据材料回答下列问题：Musicisoneofthemostbeautifulformsofartisticexp

共享题干题 （二）The Magic of Sound 根据材料回答下列问题： Music is one of the most beautiful forms of artistic expressions ever invented. In movies and plays, music has an added function: it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels( 分贝 ). Once sound exceeds this limit, even beautiful music will become ear-splitting noise and harm health. A strong blast( 响声 ) of high sound can twist and break a solid iron sheet. High sound of 150 decibels can kill a healthy rat. In movies, sometimes the hero can produce a sound that ordinary people can't hear and only those who have the same ability can feel. In nature, there is actually sound that is beyond our hearing. In physics, the sound that exceeds 20000Hz is called ultrasonic( 超音波的 ). Dolphins, whales and bats can make such high-frequency sound. It does no harm to health.Sound less than 20Hz is called infrasonic( 次声 )waves. When we move, the air will vibrate. The vibration of air can produce infrasonic wave. As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance(共振 ) in human bodies. As a result, people's vision may weaken and internal organs may rupture( 断裂 ). However, whether an infrasonic wave can be used as a weapon depends on its intensity. If its intensity is very low, it won't damage internal organs or a person's health. If the intensity of infrasonic waveexceeds 160 decibels, it is extremely harmful. When wind blows at a force of 3 or 4 over the sea, it will produce infrasonic waves of several decibels. Only typhoons can produce infrasonic waves of over 100 decibels. At present, scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.1.[不定向选择题]What does the author say about music?A.It may be harmful to people's healt B.It always cheers people u C.It is very often difficult to understan D.It sounds better when it is loud enoug 2.[不定向选择题]What could be the best title of the passage?A.The power of musi B.The harms of noise C.The magic of soun D.The discovery of infrasonic wave

1.参考答案：A
参考解析：根据第二段第二句“Once sound exceeds this limit，even beautiful music will become ear-splitting noise and harm health．”可知，一旦声音超过了这个限制，即使是美妙的音乐也将变成震耳欲聋的噪声，危害健康。因此选择A。
2.参考答案：C
参考解析：根据内容，文章从音乐入手，分别介绍了超声波和次声波，以及它们的应用，因此选择C，“声音的魔力”。3.[不定向选择题]An ultrasonic sound__________A.is very loud B.does harm to people's health C.cannot be heard by people D.is produced by the hero in movie

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