Question

1．Spending two or three hours playing outdoors each day can reduce the chance of becoming short-sighted（近视的），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（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 spend a similar amount（数量） 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（化学物质） 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．

Answer 1

分析 文章大意：根据研究，澳大利亚的儿童在户外的平均时间120分钟．如果人们一天花费两到三小时在户外玩，将减少得近视的风险．

解答 72-75：DACD
72题答案：D 细节理解题．根据文中第一段Spending two or three hours playing outdoors each day can reduce the chance of becoming short-sighted（近视的），可知，在户外花费的时间过少．故选D．
73题答案：A细节理解题．根据第三段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分钟，比澳大利亚少90分钟，所以澳大利亚是120分钟．故选A．
74题答案：C段落大意题．第五段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 from becoming short-sighted．可知主要讲为什么白天人们不会变得近视．故选C．
75题答案：D．细节题．根据第二段The Australian government researchers believe that the sunlight is good for people's eyes如果人们一天花费一段时间在户外玩，将会有更少得近视的风险．故选D．

点评 题目涉及多道细节理解题，做题时结合原文和题目有针对 性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．