2．
Smartphone，poor sight
Look around and you'll see people busy on their smartphones．Smartphones 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 smartphones and they spend an average（平均） 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（近視）since smartphones were introduced there in 1997．
Staring（盯） at smartphones for a long time gives you dry eyes．When looking at something in the distance，your eyes automatically blink（自動眨眼） a certain number of times．However，when you look at things closer to your face，the blink slows down．This reduces the amount of tears and causes discomfort in your eyes．Another bad habit is using smartphones in dark rooms before going to sleep．If you look at a bright screen while your pupils（瞳孔） become larger，too much light enters your eyes．This can do harm to the eyes and cause a disease called glaucoma（青光眼）．
While you're probably not going to stop using to your smartphones，there are a few things you can do to protect your eyes．Hold your phone at least 30centimetres 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 look at the tip of your nose．Repeat this several times．It should reduce the discomfort in your eyes．
36．The article is mainly aboutB．
A．the rules to obey when using smartphones
B．the harm that smartphones do to the users'eyes．
C．the reason why teenagers get shortsighted
D．advantages and disadvantages of smartphones
37．From Paragraph 2，we learn thatC．
A．half of the British people began to use smartphones 17years ago
B．each of the British people spends two hours a day on smartphones
C．more British people have suffered from shortsightedness since 1997
D．the number of British people who own smartphones increases by 35%
38．According to Paragraph 3，using smartphones improperly may causeA．
A．dry eyes and glaucoma
B．smaller pupils
C．too many blinks
D．more tears in the eyes
39．Which of the following is suggested by the writer？D
A．Hold the phone at least half a meter away from the eyes．
B．Turn off your phone for a couple of hours every day．
C．Look at something green far away for several minutes．
D．Don't use the phone for over an hour without a break．
40．This article is written to advise peopleC．
A．not to buy smartphones
B．to stop using smartphones
C．to use smartphones properly
D．to make full use of smartphones．
