1．Spending two or three hours playing outdoors each day can reduce the chance of becoming short-sighted（近視的），a research shows．It challenges the belief（信念） that short-sightedness is caused by computer use，watching TV or reading in weak light．
The Australian government researchers believe that the sunlight is good for people's eyes．They compared the vision（視力） 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 spend a similar amount（數(shù)量） of time reading，watching television and playing computer games．However the Singaporean children spent an average （平均） of only half an hour a day outdoors-90 minutes less than the Australian children．
Professor 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（化學(xué)物質(zhì)） which stops the eyeball from growing out of shape and prevents people from becoming short-sighted．So be outdoors．It doesn't matter if that time is spent having a picnic or having sports．
72．What causes short-sightedness according to the passage？D
A．Watching TV．
B．Playing computer games．
C．Reading in weak light．
D．Spending little time outdoors．
73．How much time did the Austra lian children spend outdoors on average according to the research？A
A.120 minutes．
B.90 minutes．
C.60 minutes．
D.30 minutes．
74．What is the fifth paragraph mainly about？C
A．What the special chemical in natural light is．
B．Why natural daylight has a special chemical．
C．Why daylight prevents people from becoming short-sighted．
D．Why daylight is hundreds of times brighter than indoor light．
75．Which of the following is TRUE according to the passage？D
A．When people begin to go to school they will become long-sighted．
B．Singaporean children have more knowledge of protecting their eyesight．
C．If people spend less time outdoors they will certainly become short-sighted．
D．Playing outside 2 or 3 hours a day can reduce the risk of getting short-sighted．
分析 文章大意：根據(jù)研究，澳大利亞的兒童在戶外的平均時間120分鐘．如果人們一天花費兩到三小時在戶外玩，將減少得近視的風(fēng)險．
解答 72-75：DACD
72題答案：D 細(xì)節(jié)理解題．根據(jù)文中第一段Spending two or three hours playing outdoors each day can reduce the chance of becoming short-sighted（近視的），可知，在戶外花費的時間過少．故選D．
73題答案：A細(xì)節(jié)理解題．根據(jù)第三段However the Singaporean children spent an average （平均） of only half an hour a day outdoors-90 minutes less than the Australian children．可知，新加坡是30分鐘，比澳大利亞少90分鐘，所以澳大利亞是120分鐘．故選A．
74題答案：C段落大意題．第五段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．可知主要講為什么白天人們不會變得近視．故選C．
75題答案：D．細(xì)節(jié)題．根據(jù)第二段The Australian government researchers believe that the sunlight is good for people's eyes如果人們一天花費一段時間在戶外玩，將會有更少得近視的風(fēng)險．故選D．
點評 題目涉及多道細(xì)節(jié)理解題，做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進行仔細(xì)分析，結(jié)合選項選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．
