The Australian government researchers did research on the eyesight and habits of 100 seven-year-old children in Singapore and Australia. The research shows that sunlight is good for people’s eyes. If you spend two or three hours playing outdoors each day, it is not easy for you to become short-sighted.
Both groups spent a similar amount of time reading, watching TV 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. As a result 30% of the Singaporean children were short-sighted —this rate（比率）was ten times higher than Australian children.
Dr. 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. 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 stop us from becoming short-sighted? Scientists believe that natural light has a special chemical（化学物质）.It can stops the eyeball from growing out of shape and stop people becoming short-sighted.
So be outdoors. It does n’t matter if that time is spent having a picnic or playing sports. 66．The researchers did research on _________ of the children in two countries.
A．habits and food B．eyesight and habits C．eyesight and food D．eyesight and studies
67．The Australian government researchers think that _________ is good for people’s eyes.
A．food B．studies C．indoor light D．sunlight 68．According to the second paragraph ,the Singapore children spend an average of _________ outdoors a day.
A．30 minutes B．90 minutes C．1 hour D．2 hours 69．What is the fourth 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 sunlight is much brighter than indoor light.
70．From the passage, we learn that _________.
A．children in Australia are more likely to become short-sighted than those in Singapore.
B．children in the city are more likely to become short-sighted than those in the countryside.
C．people won’t become short-sighted if they stay indoors every day.
D．people will all become short-sighted after they begin to go to school.
第Ⅱ卷（非选择题，共40分）
五、单词拼写（本大题共10小题，每小题1分，共10分）
根据下列句子所给的汉语注释，写出单词的正确形式，使句子意思完整。每空只填一词。71．He often has some porridge and an _________（鸡蛋）for breakfast.