Children can spend hours a day looking at computer screens and other digital devices. Some eye doctors say this leads to an increase in “computer vision syndrome(电脑视力综合症).”
Nathan Bonilla-Warford is an optometrist（验光师）in Tampa, Florida. He has seen an increase in problems in children. “A lot more children come into the office either because their parents have noticed that they have headaches or red or watery eyes or discomfort, or because their nearsightedness appears to be increasing and they’re worried,” he says.
Dr. Bonilla-Warford says part of the problem is that children may be more likely to pay no attention to early warning signs than adults. “Even if their eyes start to feel uncomfortable or they start to get a headache, they’re less likely to tell their parents, because they don’t want to have the game or the computer or whatever taken away,” he explains.
He says another part of the problem is that people blink（眨眼）less often when they use digital devices. He says, “A person who uses an electronic device blinks about one third as much as we normally do in everyday life. And so that can result in the front part of the eye drying and not staying protected like normal.”[来源:Z.xx.k.Com]
Eye doctors offer suggestions like following which is known as the 20/20/20 rule. That means every twenty minutes look away twenty feet or more for at least twenty seconds from whatever device you’re using.
Other suggestions include putting more distance between you and the device and using good lighting. Of course, another way is to spend less time looking at screens. Many experts say children should spend no more than two hours a day using digital devices—with no screen time for children under two.
But not all eye doctors have noticed an increase in problems in children. Dr. David Hunter, from Children’s Hospital Boston, has not seen an increase in his practice. “While it is possible to develop fatigue looking at screens for a long period of time, there’s certainly no proof that it actually causes any damage（伤害）to the eyes.” he says.
【小题1】Which of the following is true according to the passage?

A．Dr. Bonilla-Warford thinks using computers causes nearsightedness.

B．People keep their eyes protected against drying by blinking normally.

C．Children under two can watch TV for less than two hours a day.

D．Dr. David Hunter says headache causes an increase in eye problems.

【小题2】What does the underlined word “fatigue” mean?

A．Interest

B．Ability

C．Tiredness.

D．Difficulty.

【小题3】What can be the best title for the passage?

A．Looking at Screen: Two Hours or More

B．How Can Children Use Their Eyes Properly

C．Using Digital Devices: Advantages and Disadvantages

D．How Much Screen Time Is Too Much for Children

Children can spend hours a day looking at computer screens and other digital devices(数码设备). Some eye doctors say this leads to an increase in “computer vision syndrome(电脑视力综合症).”

Nathan Bonilla-Warford is an optometrist（验光师）in Tampa, Florida. He has seen an increase in problems in children. “A lot more children come into the office either because their parents have noticed that they have headaches or red or watery eyes or discomfort, or because their nearsightedness appears to be increasing and they’re worried,” he says.

Dr. Bonilla-Warford says part of the problem is that children may be more likely to pay no attention to early warning signs than adults. “Even if their eyes start to feel uncomfortable or they start to get a headache, they’re less likely to tell their parents, because they don’t want to have the game or the computer or whatever taken away,” he explains.

He says another part of the problem is that people blink（眨眼）less often when they use digital devices. He says, “A person who uses an electronic device blinks about one third as much as we normally do in everyday life. And so that can result in the front part of the eye drying and not staying protected like normal.”

Eye doctors offer suggestions like following which is known as the 20/20/20 rule. That means every twenty minutes look away twenty feet or more for at least twenty seconds from whatever device you’re using.

Other suggestions include putting more distance between you and the device and using good lighting. Of course, another way is to spend less time looking at screens. Many experts say children should spend no more than two hours a day using digital devices—with no screen time for children under two.

But not all eye doctors have noticed an increase in problems in children. Dr. David Hunter, from Children’s Hospital Boston, has not seen an increase in his practice. “While it is possible to develop fatigue looking at screens for a long period of time, there’s certainly no proof that it actually causes any damage（伤害）to the eyes.” he says.

1.Which of the following is true according to the passage?

A．Dr. Bonilla-Warford thinks using computers causes nearsightedness.

B．People keep their eyes protected against drying by blinking normally.

C．Children under two can watch TV for less than two hours a day.

D．Dr. David Hunter says headache causes an increase in eye problems.

2.What does the underlined word “fatigue” mean?

A．Interest.

B．Ability.

C．Tiredness.

D．Difficulty.

3.What can be the best title for the passage?

A．Looking at Screen: Two Hours or More

B．How Can Children Use Their Eyes Properly

C．Using Digital Devices: Advantages and Disadvantages

D．How Much Screen Time Is Too Much for Children

 

We live in the computer age. People use computers to do much of their work. But few people know how to look after them. Remember the following when you use your computer:

1.Keep your computer in a cool, dry room. Too much or too little heat is bad for computers. Damp(潮湿) is also bad for them.

2.Do not let people smoke near your computer. Smoke of all kinds is very bad for many parts of a computer.

3.Do not eat or drink when you are near your computer. Pieces of food and a little water in the keyboard are also bad for a computer.

4.Keep your screen clean and do not have it too bright. They are bad for your eyes. Make sure the screen is not too far from or too near your eyes. Some people use different glasses to protect their eyes when they use a computer.

1.Computers can          people to do a lot of work.

        A.use       B.help     C. make       D.take

2.Few people know how to          their computers.

        A.look at     B.try out    C.look for   D.take care of

3.A computer works well at a temperature of         .

        A.0℃      B.-5℃      C.20℃            D.35℃

4.Smoke is not good for many parts of a computer, is it?

        A.Yes,it is.  B.No,it isn't.   C.Yes,a little.  D.Not at all.

5.A dirty screen or a very bright screen is    for your eyes.

        A.bad     B.good     C.useful        D.helpful

 

We live in the computer age. People use computers to do much of their work. But few people know how to look after them. Remember the following when you use your computer:

 ① Keep your computer in a cool ,dry room. Too much or too little heat is bad for computers. Damp (潮湿) is also bad for them.

 ② Do not let people smoke near your computer. Smoke of all kinds is very bad for many parts of a computer.

 ③ Do not eat or drink when you are near your computer. Pieces of food and a little water in the keyboard are also bad for a computer.

1.Computers can ____ people to do a lot of work.

   A. help      B. make        C. use

2.Few people know how to_____ their computers.

   A. look for   B. take care of   C. look at

3.A computer works well at a temperature of _____.

   A. 0℃       B. 35℃        C. 20℃

4.Is smoking good or bad for many parts of a computer?

   A. good      B. bad         C. I don’t know.

5.A dirty screen or a very bright screen is ______ for your eyes.

A. helpful     B. good        C. bad

 

Have you ever noticed that your fingertips are winked when you’ve just finished swimming or washing dishes? It seems as if your hands have aged 30 years in a second. But is this an accident? Or is it something that nature has built into our bodies?

If your finger’s wrinkling up had no use at all, “ it wouldn’t need to.” Professor Tom Smulders from Newcastle University, UK, told BBC News. By studying wet fingers closely, Smulders and his partners found that the wrinkles looked a bit like the patterns on the car tire or on the bottom of the running shoes. So they made a guess that wrinkles on fingers might be able to help the hand hold things more tightly.

To test this, researchers asked 20 people to pick up marbles from water with their hands. But before they started, some of the people had to keep their hands in water for half an hour.

The researchers found that the people with wrinkled fingers completed the task the task faster than those with dry hands. But when they were asked to move dry marbles, all the people performed equally well, no matter they had the wrinkled fingers or not.

Our ancestors might not have played with marbles, but wrinkled fingers could have made it easier for them to climb around in the wet forests and catch fish from rivers, researchers say.

Similarly, our toes also get wrinkled in water. This may have developed from our ancestor’s need to run on wet ground.

But the question is, if wrinkled fingers are so helpful, why don’t our hands just stay that way all the time? Researchers explained that wrinkling has its disadvantage: wet fingertips are far less sensitive than smooth ones, reducing our sense of touch.

1.What does the underlined world “this ” in the third paragraph refer to?

A. Whether fingers have wrinkles after they are put in water.

B. Whether wrinkled fingers can hold things more tightly.

C. Why keeping things in water makes them wrinkled.

D. Why wrinkles help hands hold things more tightly.

2.The test shows that ________.

A. winkled hands hold dry things more tightly than dry hands do.

B. dry hands hold dry things more tightly than wrinkled hands do.

C. winkled hands hold wet things more tightly than dry hands do.

D. dry hands hold wet things more tightly than wrinkled hands do.

3.What might be the disadvantage of wrinkled fingers?

A. They are too sensitive to be touched.

B. They might be more likely to get hurt.

C. They cannot hold things tightly enough.

D. They are not so sensitive as dry fingers.