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时间:2018-05-03
《高考英语素能提高题:unit 2《growing pains》(译林牛津版必修1)》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、高考英语素能提高题:Unit2《Growingpains》(译林牛津版必修1)Ⅰ.填词Hairisoneofthecommonestpartsofthebodyandsomethingthatisgivenalotofattention.You’vehaditsincebirthandyoutakecareofiteveryday.Buthowmuchdoyouknowaboutyourhair?Theaverageheadofhairismadeupof100strands(根),eachofwhichhas
2、alifeexpectancyofaboutthreeyears.Whilesomehairsaregrowing,othersareresting,andothersarefallingout.Ahairismadeupoftwoparts:theshaft(发丝)andtheroot.Theshaftisavisible(or:seen)part.Ithasacomplexstructure.Therootisthelivingpartofthehair.Itisherewherecellsdevelopa
3、ndformtheshaft.Italsohasaverycomplexstructure.Everydayanormalheadofabout100hairswilllosebetween50and100hairs—or30,000hairsperyear.Hairdies,fallsout,andgrowsagain.Thelifecycleismadeupofthreestages.First,alongandactivegrowthperiodthatlastsaboutthreeyears—theha
4、irgrows.Second,averyshorttransition(过渡)periodthatlastsaboutthreeweeks,duringwhichtimethehairisinactive—thehairfollicleshrinks.Third,arestingperiodofaboutthreemonths—attheendofthisperiodthehairispushedoutandlost.Thiscyclerunsconstantlythroughoutlife.Ahairgrow
5、sfrom1to1.5cmeachmonthanditsusuallifeexpectancyisaboutthreeyears.Soverylonghairisrarelyseen.However,therearesomepeoplewhodogrowlonghair.Themostcommonformofhairlossdoesnotcomefromdisease.Infactwecanalmostsayitisasecondarysexualcharacteristic.Itiscalledandroge
6、neticalopecia(alsoknownaspatternbaldness)andresultsfromacombinationofgeneticandhormonal(荷尔蒙的)factors.Therearetwosortsofmelanin(黑色素)presentinalltypesofhair,indifferentproportions.Thesemakeitpossibletogetthedifferentshadesofcolor—blonde(orgolden),brownorred.Ti
7、tle:__1__Ⅱ.简答题Somescientistssaythattheworld’soceansareslowlygettingmoreacidic(酸).AccordingtotheresearchersfromCalifornia,thechangeistakingplaceduetohigherlevelsofcarbondioxide(二氧化碳)intheair,whetheryounoticeditornot.Theloweringofthewater’sPHvalueisnotgreatatt
8、hemomentbutcouldmakethelivingthingsintheseaingreatdangerifitcontinues,theywarn.KenCaldeiraandMichaelWickett,fromtheLawrenceLivermoreNationalLaboratory,reporttheirworriesinthejournalNature.Increa
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