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  3. 共用题干 Eye Problems1 Our eyes are under a great deal of strain these days as c...

共用题干 Eye Problems1 Our eyes are under a great deal of strain these days as c...

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问题 共用题干
Eye Problems
1 Our eyes are under a great deal of strain these days as computer work,television viewing,nightdriving,and even sunshine are making exceptional demands.Sunlight, especially in the summer, is now regarded as one cause of cataracts（白内障）.
2 The thinning of the ozone（臭氧）layer means more short-wave ultraviolet ( UV ) rays（紫外线） are reaching the earth,and these are the biggest risk factor for clouding the lens of the eye.Ultraviolet raysincrease the risk of changes to the cornea（角膜）causing clouded vision and eventually cataracts.The rays can be shielded only by anti-UV lenses.However, our eyes are not sufficiently protected byfashion sunglasses.
3 "Poor night vision and eye fatigue are noticeably more common,and there has been a big increase in minor eye complaints in the over-40s,"says Dr.Mireille Bonnet,who took part in recent research.She says that the six muscles controlling each eye move more than 100,000 times a day and that everyone should learn to exercise their eye muscles and allow them to rest.
4 It was traditionally thought that near- or far-sightedness were inherited conditions and could not be influenced by environmental factors,but new research is challenging this assumption.
5 Recent studies suggest that up to 80 percent of schoolchildren in the United States and western Europe are nearsighted.Years of focusing on close,two-dimensional work causes most children to become at least slightly nearsighted by the age of 10,say the researchers.
6 Problems with night vision,which affect around 25 percent of people,are also on the increase because of computer use.Using computer screens means the eye must operate in electromagnetic fields （电磁场）that make it work harder.It is estimated that 25 to 30 percent of people have eye conditions, such as difficulty with night vision,which result from staring at a screen.
选项 Over 25%of people are estimated to have difficulty with night vision due to______.
A:our parents
B:clouded vision
C:eye muscles
D:our eyes
E:computer use
F:eye move
答案E
解析文章第二段第一句便指出，过多的紫外线透过臭氧层是引起眼睛晶状体模糊的最大危险因素，并进一步分析了原因，故选B。
文章第三段的第一句便引出了本段的大意是关于夜盲症和眼疲劳，A项最为符合。
文章第五段首先陈述了儿童群体患近视的普遍性，然后论述引起儿童近视的原因，故选D。
文章第六段主要讲述了由于使用计算机而患夜盲症的人群群体比例，以及计算机是如何对人的眼睛产生伤害的，故选E。
由文章第二段第二句可知，夏季日光中过多的紫外线会增加角膜变形的危险，导致视力模糊并最终形成白内障，故选B。
文章第二段第三句中指出，这些紫外线只有通过防紫外线眼镜来防护以保护我们的眼睛，故选D。
由文章第四段可知，传统上，我们认为近视和远视是由遗传因素引起的，故选A。
由文章第六段第一句话可知，大约有25%的人群因为使用电脑而患有夜盲症，并且人群数量还有增加的趋势，故选E。
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