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Myopia can usually be corrected easily with glasses,contact lenses,or surgery,but even stillnearsighted people are at a higher risk of glaucoma ()retinal detachment,and cataracts.Thecondition's sheer pervasiveness has made researchers wonder about its causes.Scientists have proposedone of the reasons why the condition has become more common:Young people are spending too muchtime indoors,according to a report published in Nature.Studies of twins in the 1960s showed that DNA influences nearsightedness.But information fromas far back as 400 years ago indicated that genes weren't the whole story-the astronomer JohannesKepler thought his own poor vision resulted from having his nose in a book for so many years.Morerecent research has supported Kepler's hypothesis:The rise in myopia syncs up with a strongeremphasis on education.German researchers have also found that students who attended more years ofschool had a much higher rate of myopia than their less academic peers.Myopia experts haven't reached a consensus about exactly how to slow the rising tide ofnearsightedness.But one Australian researcher found that kids could maintain healthy vision byspending three hours per day under light levels of 10,000 lux or more.This is about the levelexperienced by someone under a shady tree,wearing sunglasses,on a bright summer day.Forcomparison,a well-lit classroom is usually no more than 500 lux.Many researchers agree that kids whospend more time outside will maintain good vision for much longer,plus the physical activity couldstave off overweight and improve mood.The work has sparked a number of countries to start publichealth campaigns designed to get kids outside.24.What does the author want to tell us by Kepler's example?A.Overlearning might be a cause of myopia.B.Kepler is passionately fond of reading booksC.Studies of twins in the 1960s are not accurate.D.Genes have nothing to do with nearsightedness25.What does the underlined phrase "syncs up with"in Paragraph 2 probably mean?A.takes charge ofB.gets rid ofC.keeps in step withD.gets in touch with26.What is the purpose of the text?A.To explain the exact causes of nearsightedness.B.To report research findings of nearsightedness.C.To express concern over the rise in nearsightedness.D.To warn the public of the danger of nearsightednessCTrees are able to defend themselves against diseases.They have both protective structures andprotective processes.Thanks in large part to research done by Dr.Alex Shigo,we now know a greatdeal more about the way trees protect themselves than we did 50 years ago.Just as our skin keeps harmful bacteria on the outside,bark (keeps out tree diseases.Sincethey can't move around to avoid dangers,trees need thicker "skin"than we do.Living and non-livingtissues protect tree trunks,roots,and branches from mechanical injury,drying out,and diseases.But when something destroys this first line of defense-tears through the bark-what happensinternally is interesting.When an injury occurs,a tree will transform some of its stored sugars to makemasses of defensive chemicals,which are then distributed in a specific pattern internally around thewound.Dr.Shigo was the first to document this pattern,which he called CODIT-Compartmentalization(分室化)of Decay(腐烂)in Trees.In making these CODIT compartments,trees form chemical walls to protect themselves from柯桥区高考英语适应性试题第4页（共8页）