閱讀理解。
    If you spend two or three hours playing outdoors each day, it's less likely (可能的) to get short-sighted,
a research shows. It challenges the old belief that short-sightedness is caused by computer use, watching
TV or reading in weak light. 
    The Australian scientists believe that sunlight is good for people's eyes. They did a research among 100
seven-year-old children in Singapore and Australia. According to the result, about 30% of the Singaporean
children were short-sighted while there were only 3% Australian children get short-sighted. 
    Both groups spent almost the same 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 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. There're also
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 much brighter than indoor light. But why does playing outside stop us from becoming
short-sighted? Scientists believe that natural light has a special chemical (化學(xué)物質(zhì)) which is good for our
eyeballs and stops people becoming short-sighted.
    So go outdoors, It doesn't matter if that time is spent having a picnic or playing sports.
1. Who did the research?
[     ]
A. Singaporean scientists.
B. Singaporean children.
C. Australian scientists.
D. Australian children.
2. Many people believe            caused short-sightedness in the past.
[     ]
A. computer use
B. watching TV
C. reading in weak light
D. All above
3. How much time did the Singaporean children spend outdoors on average every day in the research?
[     ]
A. 2 hours.
B. 90 minutes.
C. 1 hour.
D. 30 minutes.
4. What is the main idea of the fifth paragraph (段)?
[     ]
A. Why people become short-sighted.
B. Why natural light has a special chemical.
C. Why playing outside can stop people from becoming short-sighted.
D. Why daylight is much brighter than indoor light.
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 help protect (保護(hù)) your eyesight.
C. Children in Australia are more likely to get short-sighted than those in Singapore.
D. If you spend 2 or 3 hours playing outside every day, you will never get short-sighted.
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