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 and 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.

1.According to the passage, noise is .

A. any kind of soundB. a loud or unwanted sound

C. all sounds that you can hearD. terrible sound

2. A decibel is a .

A. unit that measures soundB. kind of noise

C. machine that makes loud noiseD. person who hates sound

3.According to the passage, loud noise can .

A. help people to sleep betterB. stop machines

C. cause a loss of hearing D. kill people

4. We can conclude from the passage that .

A. noise is a serious problemB. rock music isn’t noise

C. noise is only from trafficD. some people hate any sound

5.Study the diagram below. would be the quietest.

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

A. Room AB. Room BC. Room C D. Room D

 

Answer 1

1.B

2.A

3.C

4.A

5.B

【解析】

试题分析：这篇短文主要介绍了噪音是大声的或人们不想听到的声音。科学家使用分贝来衡量声音的响度。强度的噪音会给人们带来许多的问题。

1.Noise is a loud or unwanted sound描述可知噪音是一种大声的或你不想听到的声音。故选B

2.四段Scientists use a unit of measure called decibel(分贝) to measure the loudness of a sound.描述，可知科学家使用一种称为分贝的度量单位来衡量声音的响度。故可知分贝是一种度量单位，故选A。

3.细节理解题。根据第三段constant(不断的) loud noise can cause a loss of hearing.持续的大声音会造成听力丧失。故选C。

4.归纳理解题。根据第三四段可知噪音会给人们带来许多的严重问题，故选A

5.The sound of a quiet room, for example, measures 35 decibels.描述，可知安静的房间的分贝是35.，通过比较其他的选项，故选B。

考点：科普类短文阅读。