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1、江苏高考英语任务型阅读解题的有效性--------表格式任务型阅读：请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入恰当的单词。注意：每个空格只填一个单词。Haveyoueverwonderedwhytherearesomanyskincolorsintheworld?Doyouknowwhypeoplelivinginparticularareasusuallyhaveacertaincolor?Biologyandhistoryarethetworeasonsforthis.Skincontainssomethingcalledmel
2、anin,whichdeterminesaperson’sskincolor.Themoremelaninapersonhas,thedarkerhisorherskinwillbe.Theamountofandtheproductionofmelaninarecontrolledbygenetics,butcanbeaffectedbyotherthings,suchassunlight.Ifapersonlivesinaplacewithlesssunlight,aperson’sbodywillproducelessmelanin,making
3、theskinlighter.Skincolorisalsoaffectedbyanothersource----vitaminD.humansallneedvitaminDtobuildbones.Peoplecangetitbyeatingfoodssuchasfishandmilk,orfromsunlight,sosunlightabsorbedbymelanincannotbeusedforvitaminDproduction.Therefore,adark—skinnedpersonwillproducelessvitaminDthana
4、light—skinnedpersonwhentheyreceivedthesameamountofsunlight.TheconnectionbetweenvitaminDproductionandskincolorisclearwhenwelookatevolution.TheearliesthumanslivedinAfrica,theirdarkskinproducedlessvitaminDbecauseoftheirdarkskin.Asaresult,theirskinmadelessmelanin,sotheycouldgetenou
5、ghsunlighttoproducevitaminD.theirskingraduallygotlighterandtheylosthair.Now,peoplelivinginareaswithstrongsunlightlikeAfrica,havedarkerskin,whilepeoplelivinginotherareashavelighterskin.TheexceptiontothisistheInuit,wholiveinaplacewithlittlesunlight,buthavedarkskinbecausetheyeatal
6、otoffishandhaveenoughvitaminD.Evolutionhasgivenusarainbowofskincolors.Humanshavealwayshadmelanintodetermineourskincolor.Whathaschangedthroughhistoryistheenvironmentwherewehavelived.Thishasinturnchangedourmelaninproduction,andeventually,skincolor.Brief1Peoplelivinginaparticular2
7、usuallyhavethesameskincolorandtherearemanydifferentskincolorsintheworld.ReasonforskincolorThereasonsfordifferentskincolorsmainly3inbiologyandhistory.BiologyreasonsTheamountofmelanin,bywhichaperson’sskincoloris4,variesfrompeopletopeople.Themoremelaninapersonhas,the5hisorherskinw
8、illbe.VitaminDisanothersource6skincolor.VitaminDisnece
