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阅读下面的短文，然后根据短文内容选择最佳答案。

　　Spending two or three hours playing outdoors each day can reduce a child's chance of becoming short-sighted, a research shows．It challenges (挑战) the belief that short-sightedness is caused by computer use, watching TV or reading in weak light．

　　The Australian government researchers believe that sunlight is good for people's eyes．They compared the vision(视力) and habits of 100 seven-year-old children in Singapore and Australia．In all,30％of the Singaporean children were short-sighted－this rate(比率) was ten times higher than Australian children．

　　Both groups spent a similar amount of time reading, watching television and playing computer games．However, the Australian children spent an average(平均) of two hours a day outdoors－90 minutes more than the Singaporean children．

　　Professor(教授) Ian Morgan, from the Australian Research Council's Vision Centre, said, “Humans are naturally long-sighted, but when people begin to go to school and spend little or no time outdoors, the number of short-sighted people gets larger．We're also seeing more and more short-sighted children in cities all around the world－and the main reason may be that city children spend less time outdoors．”

　　Daylight can be hundreds of times brighter than indoor light．But why does playing outside prevent us from becoming short-sighted? Scientists believe that natural light has a special chemical(化学物质) which stops the eyeball from growing out of shape and prevents people becoming short-sighted．So be outdoors．It doesn't matter if that time is spent having a picnic or playing sports．

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阅读理解

　　Spending two or three hours playing outdoors each day can reduce a child’s chance of becoming short-sighted, a research shows．It challenges(挑战)the belief that short- sightedness is caused by computer use, watching TV or reading in weak light．

　　The Australian government researchers believe that sunlight is good for people’s eyes．They compared the vision(视力)and habits of 100 seven-year-old children in Singapore and Australia．In all, 30％of the Singaporean children were short-sighted--this rate(比率)was ten times higher than Australian children．

　　Both groups spent a similar amount of time reading, watching television and playing computer games．However, the Australian children spent an average(平均)of two hours a day outdoors－90 minutes more than the Singaporean children．

　　Professor(教授)Ian Morgan, from the Australian Research Council’s Vision Centre, said,“Humans are naturally long-sighted, but when people begin to go to school and spend little or no time outdoors, the number of short-sighted people gets larger．We’re also seeing more and more short-sighted children in cities all around the world－and the main reason may be that city children spend less time outdoors．”

　　Daylight can be hundreds of times brighter than indoor light．But why does playing outside prevent us from becoming short-sighted?Scientists believe that natural light has a special chemical(化学物质)which stops the eyeball from growing out of shape and prevents people becoming short-sighted．

　　So be outdoors．It doesn’t matter if that time is spent having a picnic or playing sports．

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　　The children at the top of the class succeed by knowing a few basic skills that others can easily learn．According to the education experts and students themselves,．here are the secrets of top students．

　　Study is the first thing．Once the books are open or the computer is on, phone calls are unanswered, TV shows unwatched, snacks unnoticed．Study is business; business comes before everything．

　　Study anywhere or everywhere．Study times are different for different children．Some work late at night when the house is quiet．Others wake early．Still others study as soon as they come home from school．However, all agree that consistency(．持之以恒)is needed．

　　Get organized．Don't waste time looking for a pencil or missing paper．Keep everything right where one can put one's hands on it．Even for a student who doesn't keep his own study area organized, a bag or a drawer is needed to put tilings in to save time．

　　Learn how to read．The secret of good reading is to be an active reader－one who continually asks questions that lead to a full understanding of the writer's message．

　　Use your time best．Even the best students put off their work sometimes．But when that happens, they face it．“If you want to be at the top, make sure to finish the work on time．”says Christi Anderson, a top student at Lyman High School．

　　Take good notes and use them．Reading the text is important, but the teacher is going to test you on what he or she emphasized(强调)．That's what you find in your notes．

　　Another kind of important“secret”of the top students is not so secret at all．For almost all of them, their parents' help is important．

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