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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.

1O1. 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.

102. 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.

103. 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 get short-sighted than those in Singapore.

D. If you spend two or three hours playing outside each day, you won’t get short-　　　　　 sighted.

100.I had no idea ______ he would offer me such a big help.

　 A. what　 B. when　 C. why　 D. whether

99..Some people might _______ for their animals, flowers, fruit and vegetables, like the biggest watermelon or the most handsome rooster.

　 A. win awards　 B. gain rewards　 C. earn awards　 D. get rewards

98.Nobody believed his reason for being absent from the class _______ he had to meet his uncle at the airport.

　A. why　 B. that　 C. because　 D. for

97.He feels______ dangerous for a girl to be out late at night so he won’t have his daughter _________ home late.

　A. /; arrive　 B. that; arrived　 C. this; to arrive　 D. it; arriving

95.We have to ________ on family expenses by more than one third.

　 A. cut up　 B. cut down　 C. cut off　 D. cut in

’t we have something different? I ________ the same food every day.

　 A. am tired from　 B. long for　 C. die from　 D. am tired of

94.Word we had been looking forward to______ that we had been admitted to the same college.

　 A. came　 B. coming　 C. come　 D. /

93.They missed the meeting. You _______ a letter _______ them how to get there.

　 A. must have written; to tell　 B. might have written; telling

C. could have written; to tell　 D. should have written; telling

92. The girl _____ got lost decided to remain _____ she was and wait for her mother.

A. who; where　 B.　 whom; that　 C. that; what　 D. which; how