When you think of all the ways your body can get hurt---falling off a bike, stepping on a nail, being bitten by a crazed dog---the aches and pains that come from sitting at a computer may not seem like much.

But more doctors are getting worried about just that. If you sit at a PC the wrong way, the nerves and muscles in your back, neck and arms can get out of line.

Ergonomics is the study of how people work and how jobs and equipment can be designed so that people are safer and more comfortable in the things they do---whether that’s working on a factory assembly line or sitting in front of a computer.

The monitor

You should not have to tilt（倾斜） your neck up or down to lock at the screen. Your eyes should be level with the top of the screen.

How far away should you sit? Reach your arm out so your fingertips just touch the screen.

The keyboard

It should be directly in front of you. Don’t unfold the legs on the bottom of the keyboard so that it tilts up toward you---it should be as flat as possible, or even tilted away from you. You want your wrists “neutral,” which means straight, not bent. This puts less strain on your nerves and muscles.

Arms should be close to the body. Don’t look at your fingers as you type. Use a document holder to hold papers at the same level as the monitor. Keep the mouse on the same level as the keyboard and close by--- so you don’t have to reach for it.

The chair

Your feet shouldn’t dangle---the blood will pool in your feet. They should rest flat on the floor, or on phone books, if necessary. Your back needs support. Roll up a towel and stick it there.

The Body

If you think of your body as a collection of right angles when you sit at a computer, you should be just fine.

Your hips should be at a 90-degree angle to your back. That takes the pressure off the spine. And your knees should bend at a 90 degree angle so your feet are flat.

1.The passage mainly talks about        .

A．avoiding pains caused by using PC           B．the science of ergonomics

C．illness caused by a computer               D．how to keep fit

2.The underlined word “ergonomics” most probably means ______ in Chinese.  

A．管理学           B．人机工程学        C．机械工程学        D．经济学

3.How high should a monitor be placed according to the passage?

A．As high as your arms.

B．A little higher than your eyes.

C．A little lower than your eyes.

D．At the same level as your eyes.

4.How shouldn’t a keyboard be placed?

A．Tilting away from you.                    B．Tilting up toward you.

C．Flat.                                  D．Not mentioned.

5.How should you place your foot?

A．Rest them on a phone book.               B．Rest them on the floor.

C．They should rest flat.                     D．They should dangle.

I am Sergey Brin! I was born in Moscow. In 1979, when I was 5, my family immigrated to the United States. I remember that on my 9th birthday I got my first computer “Commodore 64”.

Later I graduated with honors in the University of Maryland in Mathematics and IT. The main field of my science research was the technologies used to collect data from unsystematic sources as well as large quantities of texts and science data. I was the author of dozens of articles in leading American academic magazines.

The greatest event in my life happened when in 1998 I was preparing for the defense（论文答辩）of my Doctor’s degree in Stanford University. There the fate made me meet Larry Page—a young computer genius. Larry belonged to the intellectual society. Larry and I quickly became friends when we worked together.

We were searching day and night on the Internet. We were finding a lot of information but with the feeling we still couldn’t find enough of what we were looking for. Naturally the idea for a search engine that would allow specific information to be found in the endless pool of data was born like it came to us. It wasn’t our plans but we gave up the education at the university. You know the next part, maybe we managed to turn an ordinary garage in Meplo Park, California, the U. S. A. into our first office, in which Google was born. With excitement we typed the name of the thing which we created with love on September 14th 1998—www. google.com. Now, after those years we bought this garage. As a symbol it will always remind us that everything is possible.

1.Sergey Brin actually graduated from ＿＿＿.

A. the University of Maryland         B. the University of Moscow

C. the University of California         D. Stanford University

2. From the passage we know that Larry Page ______.

A. was Brin’s important partner in starting Google

B. was born in a rich merchant family

C. was once a student in the University of Maryland

D. was a professor from Stanford University

3. Which is the right order of what happened?

a. My family moved from Russia to the U. S. A.

b. I met Larry Page.

c. I was given a computer as a present on my 9^th birthday.

d. Google was born in an ordinary garage in California.

A. c-a-b-d                    B. c-b-a-d            C. a-c-b-d                          D. a-c-d-b

4.Which of the following would be the best title for this passage?

A. The History of Google                         B. The Great Contribution of Google

C. The Great Success of Google                    D. The Birth of Google

5. Which of the following statements is TRUE?

A. The main field of my science research was computer.

B. I wrote many articles in leading American magazines.

C. Larry is one of my classmates.

D. When I was 5, I got my first computer “Commodore 64”.

Some of the wolves there _________the fur.

A. are hunting                B. are hunting for

C. are hunted for            D. hunt for

—Is everyone here?

—Not yet……Look , there_______ the rest of our guests!

A．are coming        B．comes            C．is coming          D．come

In the United States, there is always ____ flow of people to areas of ______ country where more jobs can be found.

  A. a; the                         B. the ; a                        C. the; the                D. a; a