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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(拖拉機), 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.
根據短文內容，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．any kind of sound	B．a loud or unwanted sound
C．all sounds that you can hear	D．terrible sound

小題2:A decibel is a .

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

小題3:According to the passage, loud noise can .

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

小題4:We can conclude（推斷） from the passage that .

A．noise is a serious problem	B．rock music isn’t noisy
C．noise is only from traffic	D．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，產生噪音的環境以及噪音對人的危害，以引起我們的重視。
小題1:根據Noise is a loud or unwanted sound.可知選B。
小題2:根據Scientists use a unit of measure called decibel(分貝) to measure the loudness of a sound.可知選A。測量聲音的一個單位。
小題3:根據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生噪音的環境很多，對人的危害也很大，故是一個嚴重的問題，選A。
小題5:decibels是表示音量大小的一個單位，數值越小則聲音越小，故選B。
點評：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。做題時要注意文章的首段和每一段的首句或尾句，因為它們往往就是文章的主題句。

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