【阅读理解，阅读下面语言材料，然后按文后要求做题。Spendingtwoorthreehoursplayingoutdoorseachdaycanreduce(减少)achild'schanceofbecomingshort-sighted(近视)res】

　　阅读理解，阅读下面语言材料，然后按文后要求做题。

　　Spendingtwoorthreehoursplayingoutdoorseachdaycanreduce(减少)achild'schanceofbecomingshort-sighted(近视)researchshows．Itchallengesthebelifthatshort-sightednessiscausedbycomputerusewatchingTVorreadinginweaklight．

　　Australiangovernmentresearchersbelievethatsunlightisgoodforpeople'seyes．Theycomparedthevision(视力)andhabitsof100seven-year-oldchildreninChinaandAustralia．Inall30％oftheChinesechildrenwereshort-sighted．ThispercentagewastentimeshigherthanAustralianchildren．

　　BothgroupsspentasimilaramountoftimereadingwatchingTVandplayingcomputergames．HowevertheAustraliachildrenspentanaverageoftwohoursadayoutdoors90minutesmorethantheChinesechildren．

　　ProfessorIanMorgansaid“Humansarenaturallylong-sightedbutwhenpeoplebegintogotoschoolandspendlittleornotimeoutdoorsthenumberofshort-sightedpeoplegetslarger．Wearealsoseeingmoreandmoreshort-sightedchildrenincitiesallaroundtheworld-andthemainreasonmaybethatcitychildrenspendlesstimeoutdoors．

　　Daylightcanbehundredsoftimesbrighterthanindoorlight．Butwhydoesplayingoutsidepreventusfrombecomingshort-sighted?Scientistsbelievethatnaturallighthasaspecialchemical(化学物质)whichstopstheeyeballfromgrowingoutofshapeandpreventspeoplefrombecomingshort-sighted．

　　Sogooutdoors．Itdoesn'tmatterifthattimeisspenthavingapicnicorplayingsports．

　　根据材料内容选择最佳答案，并将其标号填入题前括号内。

　　(1)

　　Whatcanreduceachild'schanceofbecomingshort-sightedaccordingtothepassage?

　　[]A．

　　Playingcomputergames．

　　B．

　　watchingTV．

　　C．

　　Readingbooks．

　　D．

　　Spending2or3hoursplayingoutsideeveryday．