【題目】Spending two or three hours playing outdoors each day can reduce(減少)a child's chance of becoming short-sighted (近視), research shows. It challenges the belief 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(視力) 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 Australian 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 people gets 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 (化學(xué)物質(zhì))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.

【1】What can reduce a child's chance of becomingshort-sighted according to the passage?

A. Playing computergames. B. watching TV.

C. Reading books. D. Playing outdoors

【2】What does the underlined word "percentage"mean?

A. 百分比 B. 功率 C. 平均分 D. 效率

【3】How much time did the Chinese children spend outdoors every day?

A. 2 hours. B. 90minutes. C. 1 hour. D. 30 minutes.

【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.

【答案】

【1】D

【2】A

【3】D

【4】C

【解析】

試題本文關(guān)注的是青少年的近視問題。通過對澳大利亞和中國學(xué)生視力的對比研究，發(fā)現(xiàn)每天花兩到三小時(shí)戶外活動可以減少孩子近視的機(jī)會，建議學(xué)生多去戶外活動。

【1】題意：根據(jù)短文，什么能減少孩子近視的機(jī)會？考查細(xì)節(jié)理解題。根據(jù)Spending two or three hours playing outdoors each day can reduce a child’s chance of becoming short-sighted,research shows .，可知每天在戶外玩兩三個(gè)小時(shí)可以減少孩子近視的機(jī)會，故選D。

【2】題意：下劃線單詞“percentage”是什么意思？考查詞義理解題。根據(jù)In all,30% of the Chinese children were short-sighted .This percentage was ten times higher than Australian children.，可知是百分比，故選A。

【3】題意：中國孩子每天花多少時(shí)間在戶外？考查數(shù)字理解題。根據(jù)However , the Australia children spent an average of two hours a day outdoors ,90 minutes more than the Chinese children.，可知120-90=30（分鐘），故選D。

【4】題意：第五段主要是關(guān)于什么的？考查段意理解題。根據(jù)本段內(nèi)容結(jié)合Spending two or three hours playing outdoors each day can reduce a child’s chance of becoming short-sighted,research shows .，可知講的是在戶外玩耍對視力有好處的原因，故選C。

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