Spending two or three hours playing outdoors each day can reduce(減少)a child’s chance of becoming short-sighted（近視）,research shows . It challenges the belif that short-sightedness is caused by computer use , watching TV or reading in weak light .
Australian government researchers believe that sunlight is good for people’s eyes . They compared the vision （視力）and habits of 100 seven-year-old children in China and Australia .In all,30% of the Chinese children were short-sighted .This percentage was ten times higher than Australian children.
Both groups spent a similar amount of time reading, watching TV and playing computer games .However , the Australia children spent an average of two hours a day outdoors ,90 minutes more than the Chinese children.
Professor Ian Morgan 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 peoplegets larger. We are 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（化學(xué)物質(zhì)）which stops the eyeball from growing out of shape and prevents people from becoming short-sighted .
So go outdoors .It doesn’t matter if that time is spent having a picnic or playing sports .
根據(jù)材料內(nèi)容選擇最佳答案，并將其標號填入題前括號內(nèi)。
小題1:What can reduce a child's chance of becoming short-sighted according to the passage ?
A．Playing computer games.
B．watching TV.
C．Reading books.
D．Spending 2 or 3 hours playing outside every day.
小題2:What does the underlined word "percentage" mean?    
A．百分比B．功率C．平均分D．效率
小題3:How much time did the Chinese children spend outdoors according to the research?                                   
A．2 hours.B．90 minutes.C．1 hour.D．30 minutes.
小題4:What is the fifth paragraph mainly about?
A．Why people become short-sighted.
B．Why natural light has a special chemical.
C． Why playing outside is good for one's eyesight.
D． Why daylight is much brighter than indoor light.
小題5:Which of the following is TRUE according to the passage?  
A．People will all become short-sighted after they begin to go to school.
B．Playing outdoors for 2 or 3 hours every day can help protect your eyesight.
C． Children in Australia are more likely to become short-sighted than those in China.
D． lf you spend 2 or 3 hours playing outside each day, you will become short-sighted.

小題1:D
小題2:A
小題3:D
小題4:C
小題5:B

小題1:細節(jié)理解題，根據(jù)文中語句“Spending two or three hours playing outdoors each day can reduce(減少)a child’s chance of becoming short-sighted（近視）,research shows .”理解可知。
小題2:詞義理解題，根據(jù)文中語句“In all,30% of the Chinese children were short-sighted .This percentage was ten times higher than Australian children.
”理解可知。
小題3:細節(jié)理解題，根據(jù)文中語句“However , the Australia children spent an average of two hours a day outdoors ,90 minutes more than the Chinese children.”理解可知。120-90=30
小題4:理解歸納題，根據(jù)文中語句理解可知。
小題5:細節(jié)理解題，根據(jù)文中語句“Spending two or three hours playing outdoors each day can reduce(減少)a child’s chance of becoming short-sighted（近視）,research shows .”理解可知。
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