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    Stop. Listen! What do you hear? You may hear many different sounds. Some of those sounds may be noise. Noise is a loud or unwanted sound.
    Noise can be caused by many kinds of machines, such as motorcycles, jet planes, farm tractors(拖拉机), rock music is also noise.
    What happens to people who live near noisy machines or use them over a period of time? Doctors have found that these people have trouble in sleeping. But, most important, constant(不断的) loud noise can cause a loss of hearing.
    Scientists use a unit of measure called decibel(分贝) to measure the loudness of a sound. The sound of a quiet room, for example, measures 35 decibels. Talking measures between 40 and 65 decibels. Sounds from traffic and from some rock bands can measure over 120 decibels. Noise at this high level(层次) causes the great hearing loss.
    根据短文内容，选择正确的答案

    1. 1.

      According to the passage, noise is ______.

      1. A.
        any kind of sound
      2. B.
        a loud or unwanted sound
      3. C.
        all sounds that you can hear
      4. D.
        terrible sound
    2. 2.

      A decibel is a ______.

      1. A.
        unit that measures sound
      2. B.
        kind of noise
      3. C.
        machine that makes loud noise
      4. D.
        person who hates sound
    3. 3.

      According to the passage, loud noise can ______.

      1. A.
        help people to sleep better
      2. B.
        stop machines
      3. C.
        cause a loss of hearing
      4. D.
        kill people
    4. 4.

      We can conclude（推断） from the passage that ______.

      1. A.
        noise is a serious problem
      2. B.
        rock music isn’t noisy
      3. C.
        noise is only from traffic
      4. D.
        some people hate any sound
    5. 5.

      Study that diagram below.       would be the quietest.

       Room   Noise   Level
      A        40~65 decibels
      B        35 decibels
      C        120 decibels
      D        130 decibels

      1. A.
        Room A
      2. B.
        Room B
      3. C.
        Room C
      4. D.
        Room D
    BACAB
    试题分析：本文主要介绍了什么是噪音，产生噪音的环境以及噪音对人的危害，以引起我们的重视。
    1.根据Noise is a loud or unwanted sound.可知选B。
    2.根据Scientists use a unit of measure called decibel(分贝) to measure the loudness of a sound.可知选A。测量声音的一个单位。
    3.根据Noise at this high level(层次) causes the great hearing loss.可知选C。
    4.通过短文的描述我们可以知道生活中可以产生噪音的环境很多，对人的危害也很大，故是一个严重的问题，选A。
    5.decibels是表示音量大小的一个单位，数值越小则声音越小，故选B。
    考点：关于噪音的说明文
    点评：这样的说明性文章一般都主旨鲜明,很容易在文中找到答案。做题时要注意文章的首段和每一段的首句或尾句，因为它们往往就是文章的主题句。
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