Do you often use computers? Do you know they ...

Do you often use computers? Do you know they can be bad for some parts of your body? Computer injuries(伤害)do not happen suddenly, but slowly. Now let's learn to use a com­puter safely.

Your eyes

Your eyes should be at least 50 cm from the screen. Remember to look away from it sometimes. This gives your eyes a rest.

When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect(反射)on the screen. If the window is in front of you, the sun and the screen will both shine into your eyes.

Your hands and wrists(手腕)

If you use a keyboard for a long time, follow these three rules: Rest your wrists on some thing; Keep your elbows at the same height as the keyboard and stop sometimes to exercise your hands and wrists in a different way.

Your back

If you sit for many hours in front of a computer in the wrong way，you can injure your back or neck. So you should sit with your back straight. The top part of the screen should be in front of your eyes. If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and neck.

Enjoy your computer, but use it safely.

任务型阅读:根据短文内容，填写下列表格。

九年级英语阅读理解困难题查看答案及解析

“First Blood, Shut down ...” Do you know these words well? They are ____ used in the computer games, such as King Glory, Cross Fire. These days computer games have become more and more popular in many towns and cities, even villages. A lot of small shops ____ busy streets have been changed into computer game houses ____ they can get more money.

The houses are always crowed with people , especially young boys. Sometimes people ____lots of money competing with the machines. People have a kind of gambling psychology(赌博心理)when they play computer games. The more they lose, the more they want to win. As a result, they don’t want to work any more and play games day after day.

For school boys, things are even ____. They have no ____ in their lessons. ____ school is over, they rush to the computer game houses near their schools. Some are ____ enough to get money from their parents while some aren’t. So they _____ steal or rob others.

Computer game addiction(上瘾) is a____ problem in our life. Something has to be done to stop it.

1.A. highly　　 B. widely　　 C. deeply　　 D. lonely

2.A. above　　 B. across　　 C. along　　 D. between

3.A. so that　　 B. when　　 C. unless　　 D. in order to

4.A. take　　 B. pay　　 C. spend　　 D. cost

5.A. better　　 B. exciting　　 C. worse　　 D. interesting

6.A. interest　　 B. time　　 C. chance　　 D. grades

7.A. Because　　 B. Before　　 C. Until　　 D. As soon as

8.A. lucky　　 B. unlucky　　 C. careful　　 D. polite

9.A. can　　 B. should　　 C. could　　 D. have to

10.A. important　　 B. serious　　 C. unusual　　 D. wonderful

九年级英语完形填空困难题查看答案及解析

Computers are very useful, they can _____ sending e-mails.

A.be used to     B.be used with     C.be used for

九年级英语单项填空简单题查看答案及解析

Computers are useful. For example, they can ________ sending e-mail.

A.used to B.be used to C.be used for D.be used

九年级英语单选题中等难度题查看答案及解析

Do you often listen to music at loud volumes（音量）? You should know that this habit is bad for your hearing, according to the World Health Organization (WHO).

Over 1 billion young people have problems in listening because they listen at loud volumes for a long time, WHO said. Listening to music or watching a TV show at loud volumes can harm your hearing.

The United Nations has standards for safe listening. It is not safe to listen to sounds that are louder than 85 decibels (分贝) for eight hours or 100 dB for 15 minutes. The sound of a busy road is about 85 dB and the sound of a rock concert can be about 100 dB.

Loud noise is harmful to the inner ear. Most of us are born with about 16,000 hair cells (听毛细胞) in our inner ears. These cells detect (探测) sounds. However, listening to loud noise for a long time can make these cells work too hard and make some of them die. This is why people have hearing loss.

Some people might think that their music isn’t all that loud. But this can depend on where you are. For example, if you are in a noisy place like the subway, you might turn up your music too loud without realizing it. Later, when you listen to it at the same volume in a quiet place, you might feel uncomfortable.

WHO said the “safe level” for most sound is below 80 decibels for up to 40 hours a week. A level of 80 decibels is roughly equal to the noise of a subway.

1.According to the story, WHO suggests that it is NOT safe to _____.

A. listen to music every day B. watch TV for over an hour

C. listen to loud sounds for long D. go to a rock concert

2.The sound level of a busy road is about _____.

A. 80 dB B. 85 dB

C. 100 dB D. 115 dB

3.Why can listening to loud music cause hearing problems?

A. Because it puts our brains under great pressure.

B. Because it can cause hair cells in the inner ear to die.

C. Because it prevents our ears from resting.

D. Because it allows people to get used to listening to loud sounds.

4.What can we get from the last paragraph?

A. People love to listen to loud music.

B. It’s reasonable to listen to loud music in some places.

C. People are likely to listen to music on the subway.

D. People don’t always realize how loud their music is.

九年级英语阅读单选中等难度题查看答案及解析

Do you often listen to music at loud volumes（音量）? You should know that this habit is bad for your hearing, according to the World Health Organization（WHO）.

Over 1 billion young people are at risk of hearing loss due to listening to loud noise for long periods of time, WHO said. Listening to music or watching a TV show at loud volumes can harm your hearing.

The United nations has standards for safe listening. It is not safe to listen to sounds that are louder than 85 decibels（dB分贝）for eight hours or 100 dB for 15 minutes. The sound of a busy road is about 85 dB and the sound of a rock concert can be about 100 dB.

Loud noise is harmful to the inner ear（内耳）. Most of us are born with about 16,000 hair cells（听毛细胞）in our inner ears. These cells detect sounds. However, listening to loud noise for a long time can make these cells work too hard and cause some of them to die. This is what causes hearing loss.

Some people might think that their music isn’t that loud. But this depends on where you are. For example, if you are in a noisy place like the subway, you might turn up your music too loud without realizing it. Later, when you listen to it at the same volume in a quiet place, you might feel uncomfortable.

WHO said the “safe level” for most sound is below 80 dB for up to 40 hours a week. A level of 80 dB is nearly equal to the noise of a subway.

1.Which of the following is bad for our hearing?

A.Reading books aloud in the morning. B.Talking with friends now and then.

C.Listening to music loudly more often. D.Using smart phones for a long time.

2.Listening to sounds louder than 85 decibels for _________ hours is not safe for our listening.

A.5 B.6 C.7 D.8

3.From the fourth paragraph, we can know that ________.

A.inner ear can stop from the louder noise

B.hair cells in inner ear are very important for people

C.people can hear without hair cells

D.hair cells are not something people are born with

4.The underlined word “detect” in the fourth paragraph probably means “________”.

A.discover B.doubt C.cancel D.remain

5.The best title（题目）for the passage can be _________.

A.The inner ear B.UN safety listening standards

C.Pay attention to protecting our hearing D.The “safe level” for sound

九年级英语阅读单选中等难度题查看答案及解析

Have you ever noticed the black and white bars on a book？Do you know what they are used for?

They are bar-codes（条形码）used in most products. If you go to a supermarket，you can see almost every product with a bar-code on it. Bar-codes have information about the product, such as name and production date.It's an easy and convenient way to know about the products. Just scan the bar-code and everything is clear.

The first use of a bar-code in a supermarket checkout system was on a pack of American Wrigley Company chewing gum in 1974.Beyond supermarkets, bar-codes are needed everywhere:for renting cars, for luggage checks on a plane, for parcels(包裹) you send. Life would be rather difficult without bar-codes.Most of our things would get lost in the post.

Bar-codes change as well.Bar-codes in the past were 1-D(one-dimensional空间), but now there are 2-D bar-codes,such as QR code.Since 2009, QR has been used on Chinese train tickets. People can enter stadiums,cinemas and theaters by holding certain types of bar-codes.

With these small codes, life is getting much easier for us.

If you find these bar-code things boring, a bar-code building might be more up your street. In St Petersburg, Russia, there is a building designed like a bar-code.It looks strange, but it's actually a shopping mall. There are games too. Bar-code Monsters is a mobile phone game. You have to scan bar-codes and find the monsters!

1.Bar-codes were first used in ________.

A.1974 in the UK B.1974 in the US C.2009 in China D.2009 in Russia

2.The underlined word “scan”might mean “________” in Chinese.

A.复印 B.展示 C.描写 D.扫描

3.From Paragraph 3 and 4, we can learn that ________.

A.bar-codes are very useful in our daily life B.our things will get lost without bar-codes

C.bar-codes make our life rather difficult D.we can’t live without bar-codes

4.Which of the following is NOT true about the bar-code building?

A.It looks like a bar-code. B.It’s in St Petersburg, Russia.

C.It’s used as a shopping mall. D.Its name is Bar-code Monsters.

5.The best title of this passage is________.

A.From 1-D Bar-codes to 2-D Bar-codes B.Why Bar-codes are Black and White

C.Small Codes that Make a Big Difference D.What if the World Doesn’t Have a Bar-code

九年级英语阅读单选中等难度题查看答案及解析

If you know something is bad for you, why can't you just stop? About 70% of smokers say they would like to stop. Drug and alcohol abusers (酗酒者) struggle to give up the bad habits that hurt their bodies and destroy families and friendships. And many of us have unhealthy weight that we could lose if only we would eat right and exercise more. So why don't we do it？

Some scientists have been searching for answers. They've studied what happens in our brains as habits form.They've found answers to why bad habits, once formed, are so difficult to kick. And they're developing ways to help us make the changes we'd like to make.

Habits are a normal part of life，and are often helpful."We wake up every morning，shower，comb our hair or brush our teeth without being aware of it， "Volkow says. We can drive along familiar routes without really thinking about the directions."When behaviors become automatic(不加思索的)，it gives us an advantage，because the brain does not have to perform the action on purpose."Volkow says.This frees up our brains to focus on different things.

One way to kick bad habits is to focus on your unhealthy habits. Then try your best to stop them.For example, habits can be linked in our minds to certain places and activities.You could develop a plan, say, to avoid walking down the hall where there's a candy machine. Try to avoid going places where you've usually smoked.Stay away from friends and situations linked to problem drinking or drug use.

Another helpful way is to replace unhealthy habits with new, healthy ones. "It doesn't work for everyone, "Volkow says. "But certain groups of patients who have a history of taking a drug can do something else like running and it helps them stay away from drugs."

1.In the first paragraph, the writer mainly wants to tell us　　　 .

A. we should stop something bad for us

B. most smokers would like to stop smoking

C. bad habits are really difficult to give up

D. eating right and exercise more can lose weight

2.Scientists studied what happened in our brains as habits form in order to　　　 .

A. find answers to solve the problem

B. find ways to form good habits

C. kick their own bad habits

D. help us see how bad habits form

3.Why are habits often of great help to us?

A. because they make our life normal.

B. because they made us do something better.

C. because they made us think more about life.

D. because they make our brain focus on other things.

4.If you want to kick bad habits you'd better　　　 .

A. focus on them on purpose　　 B. go to the places linked with them

C. do something linked with them　　 D. ask your friends for help

5.What is the main idea of the passage？

A. Breaking bad habits.

B. Forming good habits.

C. Finding reasons for bad habits

D. Replacing bad habits with good ones.

九年级英语阅读单选中等难度题查看答案及解析

Do you know that you can use the Internet to buy things? For several 　　　　 , Americans have enjoyed online shopping. Now online shopping is starting in the world. In many countries, people can 　　　　 their computers and shop for clothes, food, toys and many other things.

Online shopping is in fashion in England. For example, the ABC Company is one of the biggest 　　　　 in 15 European countries. It sells different kinds of things over the Internet, and in one year it made ＄100 million. In France, until last year online shopping was only possible 　 　 　　　　 one web page. Then the government allowed more online shopping. The Frenchmen spend much money a year 　　　 things through these web pages. French businesses are hoping this new online shopping will help them sell more things in the future.

Some people like online shopping because it allows them to do 　　　 shopping without leaving their homes. And they don’t have the problems of traffic in the cities. But they usually worry 　　　　 the quality of the things for sale over the Internet. Good quality is 　　　　 to them. So the companies will have to be more careful about the quality of the things 　　　 sell. Because people always care about both the quality 　　　 the price. Enjoy online shopping!

1.A. hours　　 B. days　　 C. weeks　　 D. years

2.A. turn on　　 B. turn up　　 C. turn down　　 D. turn off

3.A. country　 B. countries　　 C. company　　 D. companies

4.A. at　　 B. on　　 C. in　　　 D. of

5.A. buying　 B. keeping　　 C. saving　　 D. doing

6.A. his　　 B. her　　 C. its　　 D. their

7.A. in　　 B. about　　 C. of　　 D. with

8.A. difficult　 B. interesting　　 C. important　　 D. different

9.A. it　　 B. he　　 C. she　　 D. they

10.A. and　　 B. or　　 C. so　　 D. But

九年级英语完形填空中等难度题查看答案及解析

—Do you know ______?

—For a month.

A.how long will she be away

B.how long she will be away

C.how often will she go there

D.how often she will go there

九年级英语单选题中等难度题查看答案及解析