题目内容
—Noise is _____to human’s health.
—Yes, we shouldn’t talk loudly in public.
A. harmful B. harm C. harmless
A
【解析】
试题分析：句意：噪音对人类的健康有害。是的，我们不应该在公众场合大声讲话。harmful有害的，形容词，故选A
考点：harmful一词的用法
点评：be harmful to对…害的，属于固定短语。此类题目不难，重在理解句意和选项的意思，细心作答即可。
一课一练课时达标系列答案In Britain, you should try not to put your hands on the table when you’re having a meal. In Mexico, however, they hope you keep the hands on the table during a meal. But Arabians consider you must be very careful with your hands. You mustn’t eat with your left hand. Arabians consider it very bad manners eating with left hands. So, what should you do if you are on a visit in another country? Well, you can ask the local people to help you or just watch carefully and follow them if you are on a visit in another country.
【小题1】It is impolite to lift your bowl to your mouth when you are having some soup in _________.
| A．Britain | B．China | C．Japan | D． Mexico |
| A．you are rude | B．you are hungry | C．you dislike the food | D．you like the food |
| A．People in different countries have different ways of doing things. |
| B．British people are very polite. |
| C．You mustn’t eat with your left hand. |
| D．Don’t worry about making a noise when you have soup. |
The poor countries have some difficult problems. Sometimes the land is too poor to grow 32 on. People there have 33 rich land nor enough water. The land 34 be made better, but a lot of things must be done. The people must be taught and water must 35 .
But rich countries have problems, too. There are not always good places to 36 . Sometimes the air is not clean and the rivers are too 37 to swim in or to drink. The roads and streets are full of people and cars. Cars and buses have to move 38 . Noise is too much. Some people have no houses to live in. Something must be done about these problems. The air and the rivers must be cleaned and be 39 clean. More houses have to be built. 40 these things cannot be done easily.
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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.
根据短文内容，选择正确的答案（每小题1分，共5分）
【小题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 |
| A．unit that measures sound | B．kind of noise |
| C．machine that makes loud noise | D．person who hates sound |
| A．help people to sleep better | B．stop machines |
| C．cause a loss of hearing | D．kill people |
| A．noise is a serious problem | B．rock music isn’t noisy |
| C．noise is only from traffic | D．some people hate any sound |
| Room Noise Level A 40~65 decibels B 35 decibels C 120 decibels D 130 decibels |