问题详情：
Smartphone, poor sight
Look around and you’ll see people Busy on their smart phones. Smart phones do make our lives easier . But have you ever thought about what they mean to you eyes?
According to a study, half of British people own smart phones and they spend an average of two hours a day using them . There has been a 35% increase in the number of people in the UK who suffer from shortsightedness since smart phones were introduced there in 1997.
Staring at smart phones for long time gives you dry eyes. When looking at something in the distance, your eyes automatically blink a certain number of times. However ,when you look at things closer to your face ,the blinking slows down . This reduces the amount of tears and causes discomfort in your eyes. Another bad habit is using smart phones in dark rooms before going to sleep. If you look at a bright screen while your pupils become larger, too much light enters your eyes. This can do harm to the eyes and cause a disease called glaucoma.
While you’re probably not going to stop using to your smart phone, there are a few things you can do to protect your eyes. Hold your phone at least 30 continues away from your eyes when using it. Take a break every hour and try the following: look at something at least five meters from you and then focus on the tip of your nose. Repeat this several times. It should reduce the discomfort in your eyes.
( )1. The article is mainly about ________.
A. the rules to obey when using smart phones
B. the harm that smart phones do to users’ eyes.
C. the reason why teenager get shortsightedness
D. advantages and disadvantages of smart phones
( )2. From Paragraph 2，we learn that _______.
A. half of the British people began to smart phones 17years ago
B. each of the British people spends two hours a day on smart phones
C. more British people have suffered from shortsightedness since 1997
D. the number of British people who own smart phones increases by 35%
( )3. According to Paragraph 3, using smart phones improperly may cause _______.
A. too many blinks B. more tears in the eyes
C. smaller pupils D. dry eyes and glaucoma
( )4. Which of the following is suggested by the writer?2
A. Don’t use the phone for over an hour without a break.
B. Hold the phone at learn half a meter away from the eyes.
C. Turn off your phone for a couple of hours every day.
D. Look at something green far away for several minutes.
( )5. This article is written to advise people_______.
A. not to buy smart phones B. to stop using smart phones
C. to make full use of smart phones D. to use smart phones properly
【回答】
1B 2C 3A 4B 5D
知识点：说明文
题型：阅读理解
