1. (2021九上·梁山月考) 阅读理解

Listen! What do you hear? You may hear many different Sounds. Some of those sounds may 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 and65decibels. 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. （1） 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. （2） 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
5. （3） We can conclude (推断)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 s
7. （4） According to the diagram (图表) below, _________ would be the quietest.

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

   A . Room A B . Room B C . Room C D . Room D