Computers can injure you. Most other injuries happen suddenly. For example, if you fall off a bike and break your arms, it happens very quickly. But computer injuries slowly.

You probably know how to ride a bike safely. Now learn to use a computer safely.

Your eyes

Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be at least 50 centimeters 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 on (反射) 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)

Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long time, follow these three rules: 1) Rest your wrists on something. 2) Keep your elbows at the same height as the keyboard. 3) Stop something and exercise your hands, wrists and fingers in a different way.

Your back

Some people sit for many hours in front of a computer. If you sit in the wrong way, you can injure your back or your neck. So you should sit with your back straight. The top part of the screen should all be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel (平行) to the floor. If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and necks.

Enjoy your computer, but use it safely.

1.A computer screen may injure your eyes if __________.

A．you sit 60 centimeters away

B．you remember to look away

C．your eyes are too close to it

D．the window is on your left or your right

2.Hand and wrist injuries are caused when you _________.

A．get plenty of exercise

B．move in the same way again and again

C．rest your wrists on something

D．keep your elbows as high as the keyboard

3.Your eyes and hands will be safe if __________.

A．you work near a window

B．you often take a rest from working

C．you use a keyboard for a long time

D．the window is behind you

4.It is good for your back and neck if you sit __________.

A．in the right way

B．for many hours

C．with the screen below your eyes

D．with your back leaning forward

5.What would be the best title for the passage?

A．How to protect your eyes.

B．How to protect your hands and wrists.

C．How to use a computer safely.

D．How to protect your back.

 

There is a big tree_______.

A．in front of my house	B．in the front of my house
C．at the front of my house	D．in front of my the house

 

 

The air pollution was so bad in Harbin, in China, on October 21,2013 that the city had to close roads and schools, and cancel* hundreds of flights from its airport.

News reports said the smog (a mixture of smoke and fog) was so thick that people couldn’t see more than 10 or 20 metres in front of them.

It is also said that people could not even see the person standing next to them. The city’s website said: “You can’t see your own fingers in front of you.”

The local people said there was a “burning” smell in the air. Many people covered their noses and mouths with scarves or masks*.

The pollution was caused on several factors* including: farmers burning off old corn stalks* and crop stubble*; coal*-fired heating systems; and low winds that allowed the smoke to remain over the city.

The smog had been building up for several days. It became worse when the city turned on the public heating system, which uses coal to heat millions of homes and offices in the city.

Harbin has a population of more than 10 million people. It lies in northeastern China, where cold winter weather can last up to six months. The main fuel* there is coal, because it is cheaper than other types of fuel.

Air pollution from burning coal can cause health problems like heart disease. During the smog crisis* in Harbin, the number of people taken to the hospital with breathing problems was 30% higher than usual.

The city government is trying to reduce its use of coal by adding more insulation* and better roofs and windows to buildings to reduce heating needs. It has also used cleaner fuel for cars and factories.

1.The roads and schools in Harbin had to be closed on October 21, 2013 because of  ____

A. the heavy rain   B. the strong wind  C. the serious smog  D.  the terrible snow        

2.There are many reasons for the air pollution EXCEPT____________.

A. farmers burn off old corn stalks and crop stubble                   

B. people use coal to heat millions of homes and offices

C. The smoke remains over the city   because of low winds

D. Many buses and cars use cleaner fuel and so do factories.

3. What is the government trying to do when the air pollution get worse?

A. To offer cars new fuel.                          

B. To give people more masks.

C. To reduce its use of coal.               

D. To ask people to stay at home.

4.What does the passage mainly tell us?

A. The serious air pollution in China   

B. Coal-fired heating systems

C. The population crisis in Harbin      

D. The reasons for heart disease

 

首字母填空
Life is not easy, so I’d like to say “When anything happens, believe in yourself.”
When I was 14, I was too nervous to talk to anyone. My classmate often l___【小题1】__ at me. I was sad but could do nothing. Later, s___【小题2】___happened. It changed my life. It was an English contest. My mother asked me to take part in it. What a terrible idea! It meant I had to s___【小题3】__ in front of all the teachers and students of my school!
“Come on, boy. Believe in yourself. You are sure to w__【小题4】___.” Then, Mother and I talked about many different topics. At last I c___【小题5】___the topic “Believe in yourself”. I tried my best to r__【小题6】____ all the speech and practice it over 100 times. W __【小题7】____ my mother’s great love, I did well in my contest. I could h__【小题8】___ believe my ears when the news came that I had won the first place. I heard the cheers from the teachers and students. Those c__【小题9】__ who once looked down on me, now all said “Congratulation!” to me. My mother hugged me and cried excitedly.
S___【小题10】___ then, everything has changed for me. When I do anything, I try to tell myself to be sure and I will find myself . I try to tell myself to be sure and I will find myself. This is true not only for a person but also for a country.

Life is not easy, so I’d like to say,“When anything happens, believe in yourself.”When I was 14,  I was__1__ nervous to talk to anyone. My classmates often laughed at me. I was sad but could do nothing. Later__2_ happened. It affected my life. It was an English speech contest. My mother asked me to take part in it. What a/an__3 idea! It meant I had to___4__ in front of all the teachers and students of my school!
“Come on, boy. Believe in yourself. You are sure to win.” Then mother and I talked about many different topics. At last I chose the topic” Believe in yourself”. I tried my best to _5_ all the speech and practised it over 100 times.  __6__my mother’s great help, I did well in the contest. I could hardly (几乎不) believe my _7_ when the news came —— I won the first place. I heard the   8 from the teachers and students. Those__9__looked down on （瞧不起）me before, but they now all said congratulations to me. My mother hugged (拥抱)me and cried excitedly.
Since then, everything changed for me. When I do anything, I try to tell  10 to be sure and I will find myself. This is true not only for a person but also for a country.
【小题1】A. so            B. too         C. very
【小题2】A. something     B. nothing     C. anything
【小题3】A. interesting   B. exciting     C. terrible
【小题4】A. say          B. speak        C. tell
【小题5】A. remember      B. see          C. hear
【小题6】A. At            B. To           C. With
【小题7】A. ears          B. eyes        C. result（结果)
【小题8】A. cheers        B. wishes       C. thanks
【小题9】A. boys          B. girls       C. classmates
【小题10】A. my mother     B. him          C. myself