Howlonghas3-Dtechnologybeenaro-查字典问答网

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　　Howlonghas3-Dtechnologybeenaround?Mostofusmightthinkofcrowdsofteenagersina1950’smoviehousewatchingBwanaDevilin3-D.But3-Dtechnologymadeitsfirstappearanceonthescenein1838withthefirststereoscope(体视

　　Althoughithassuchalonghistorythetechnologyhasstillremainedbasedononesimpleprinciple-----tomake3-Deffectsyoumustfindawaytoprojecttwoslightlydifferentpicturestoeacheye.Modern3-Dtechnologyworksbyrapidlyflickering(闪动)twoversionsofthemovieandprojectingthemontoeacheye.Thebraindoestherestoftheworkcombiningthetwopicturestogetherintooneandgivingtheshowtheappearanceofdepththethirddimension.

　　Butdoesthisexposureespeciallylongexposurescauseharmtothechild’sdevelopingbrainandvisualsystem?Unfortunatelylong-termstudiesonnewflickerdigital3-Dtechnologyandchildrenaren’tyetavailable.Wedonotknowifregularordaily3-Dviewingoveryearsaffectsthedevelopingvisualsystemalthougholder3-Dmethodsbasicallydothesamethingandarenotconsideredharmful.

　　Thequestionofpossibleharminmodern3-DuseinTVisreallybasedontwofacts:theamountoftimechildrenwillnowbewatching3-DTVeachdayandthesensitivitysomechildrenshowinreactionto3-Dviewing.Itisdifficulttomakeactuallabstudiesoflongerterm3-Dviewinginchildrenbecauseofthepossibleharmoftheexperiment.Researcherswillhavetowaituntil3-DTVtechnologyisalreadyinthemarketplaceforanumberofyearsthencheckheavy3-DTVwatchersandcomparethemwithnon-watchers.

　　Witha3-Dtelevisiontechnologyinthehomewewillsoonbeabletoanswerthequestionofwhetherornotlongerandmorefrequentperiodsof3-Dexposurecausemorechangesinthevisualsystem.WemayfindthatthebiggerproblemistheintroductionofanewtechnologythatleadstoevenmoretimespentonTVratherthanplayingoutdoors.

　　1.Accordingtothetext3-Dtechnology______

　　A.wasrefusedbypeoplewhenitfirstappeared.

　　B.willsoonchangethewaywewatchTV.

　　C.doesnogoodtoourvisualsystem.

　　D.hasahistoryofnearly200years.

　　2.Paragraph2ismainlyabout________

1回答

2020-03-31 16:23

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唐大伟

　　1.D

　　2.A

　　3.A

　　4.B

　　分析：

　　本文介绍了3-D技术有很长的历史，不仅给我们带来了视觉上的享受同时也给孩子们带来了一些负面影响，孩子们看电视的时间要比户外运动时间长。

　　1.But3-Dtechnologymadeitsfirstappearanceonthescenein1838withthefirststereoscope(体视镜).得知3-D科技有将近200年的历史，故选D。

　　2.第二段内容Modern3-Dtechnologyworksbyrapidlyflickering(闪动)twoversionsofthemovieandprojectingthemontoeacheye.，得知主要讲述了3-D的工作原理，故选A。

　　3.Researcherswillhavetowaituntil3-DTVtechnologyisalreadyinthemarketplaceforanumberofyearsthencheckheavy3-DTVwatchersandcomparethemwithnon-watchers.得知研究人员会再等等看，选A。

　　4.写作目的题。根据WemayfindthatthebiggerproblemistheintroductionofanewtechnologythatleadstoevenmoretimespentonTVratherthanplayingoutdoors.得知本文写作目的是讨论看3-D是否对孩子们有害。选B。

　　考点：

　　科普类文章

2020-03-31 16:25:51

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