Question

 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 a 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 importantly,constant(不断的)loud noise can cause 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 its high level(层次)causes great hearing loss.

根据材料内容选择最佳答案。

(   ) 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

(   ) 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

(   ) 3. According  to the passage,loud  noise  can

A. help people to sleep better

B. stop machines

C. cause loss of hearing

D. kill people

(   ) 4. We can  conclude 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

(   ) 5. Studying 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

Answer 1

1. B 根据第一段最后一句 Noise is loud or unwanted sound可知。

2. A 根据第 H 段第一句 Scientists use a unit of

measure called decibel to measure the loudness of a sound.可知。

3. C根据第三段最后一句…constant and noise can cause loss of hearing.可知 

4. A根据文章大意可知噪音是一个很严重的问题。

5.B根据文章的最后一段可知分贝越大，噪音越大。