Question

Spending two or three hours playing outdoors each day can reduce(减少)a child’s chance of becoming short-sighted（近视）,research shows . It challenges the belif that short-sightedness is caused by computer use , watching TV or reading in weak light .
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 China and Australia .In all,30% of the Chinese children were short-sighted .This percentage was ten times higher than Australian children.
Both groups spent a similar amount of time reading, watching TV and playing computer games .However , the Australia children spent an average of two hours a day outdoors ,90 minutes more than the Chinese children.
Professor 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 peoplegets larger. We are 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 go outdoors .It doesn’t matter if that time is spent having a picnic or playing sports .
根据材料内容选择最佳答案，并将其标号填入题前括号内。
小题1:What can reduce a child's chance of becoming short-sighted according to the passage ?

A．Playing computer games.

B．watching TV.

C．Reading books.

D．Spending 2 or 3 hours playing outside every day.

小题2:What does the underlined word "percentage" mean?    

A．百分比

B．功率

C．平均分

D．效率

小题3:How much time did the Chinese children spend outdoors according to the research?                                   

A．2 hours.

B．90 minutes.

C．1 hour.

D．30 minutes.

小题4: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.

小题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 can help protect your eyesight.

C． Children in Australia are more likely to become short-sighted than those in China.

D． lf you spend 2 or 3 hours playing outside each day, you will become short-sighted.

Answer 1

小题1:D
小题2:A
小题3:D
小题4:C
小题5:B

小题1:细节理解题，根据文中语句“Spending two or three hours playing outdoors each day can reduce(减少)a child’s chance of becoming short-sighted（近视）,research shows .”理解可知。
小题2:词义理解题，根据文中语句“In all,30% of the Chinese children were short-sighted .This percentage was ten times higher than Australian children.
”理解可知。
小题3:细节理解题，根据文中语句“However , the Australia children spent an average of two hours a day outdoors ,90 minutes more than the Chinese children.”理解可知。120-90=30
小题4:理解归纳题，根据文中语句理解可知。
小题5:细节理解题，根据文中语句“Spending two or three hours playing outdoors each day can reduce(减少)a child’s chance of becoming short-sighted（近视）,research shows .”理解可知。