A. outdoors B. habits C. different D. similar E. reduce

Spending two or three hours playing outdoors each day can 【小题1】 the chance of becoming short-sighted， 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 【小题2】 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 【小题3】 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 【小题4】 —90 minutes less than the Australian children.