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(拖拉機(jī)), 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(不斷的) loud noise can cause a loss of hearing.
Scientists use a unit of measure called decibel(分貝) 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(層次) causes the great hearing loss.
根據(jù)短文內(nèi)容，選擇正確的答案（每小題1分，共5分）
小題1:According to the passage, noise is      .
A．a(chǎn)ny kind of soundB．a(chǎn) loud or unwanted sound
C．a(chǎn)ll sounds that you can hearD．terrible sound
小題2:A decibel is a      .
A．unit that measures soundB．kind of noise
C．machine that makes loud noiseD．person who hates sound
小題3:According to the passage, loud noise can      .
A．help people to sleep betterB．stop machines
C．cause a loss of hearingD．kill people
小題4:We can conclude（推斷） from the passage that      .
A．noise is a serious problemB．rock music isn’t noisy
C．noise is only from trafficD．some people hate any sound
小題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
      A. Room A        B. Room B           C. Room C           D. Room D 

小題1:B
小題2:A
小題3:C
小題4:A
小題5:B

試題分析：本文主要介紹了什么是噪音，產(chǎn)生噪音的環(huán)境以及噪音對(duì)人的危害，以引起我們的重視。
小題1:根據(jù)Noise is a loud or unwanted sound.可知選B。
小題2:根據(jù)Scientists use a unit of measure called decibel(分貝) to measure the loudness of a sound.可知選A。測(cè)量聲音的一個(gè)單位。
小題3:根據(jù)Noise at this high level(層次) causes the great hearing loss.可知選C。
小題4:通過短文的描述我們可以知道生活中可以產(chǎn)生噪音的環(huán)境很多，對(duì)人的危害也很大，故是一個(gè)嚴(yán)重的問題，選A。
小題5:decibels是表示音量大小的一個(gè)單位，數(shù)值越小則聲音越小，故選B。
點(diǎn)評(píng)：這樣的說明性文章一般都主旨鮮明,很容易在文中找到答案。做題時(shí)要注意文章的首段和每一段的首句或尾句，因?yàn)樗鼈兺褪俏恼碌闹黝}句。
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