红对勾2016届高考英语人教版一轮复习课时作业2

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1、课时作业2　EnglisharoundtheworldⅠ.阅读理解(2015·湖北省天门中学元月质检)Heavysnowfallandchillingtemperaturesof－30℃donotstopcriminalsinnorthernRussia.Nowpolicetryingtomaintainlawintheregionarestrugglingontheirsnowmobilesandwanttousereindeertocombatcrimeonthebleaktundra(阴冷的冻土地带)．Theysaythatthatmammalsaremorereli

2、ablethantheirmachinesandcanrunfastondeepsnowthankstotheiradaptablehooves.Someareasofthecountry'sArcticregionareonlyaccessiblebyreindeerandthelzvestianewspaperhasreportedthatagangofSiberia'sindigenous(本土的)peopleareusingreindeertomakeaspeedygetawayfromcrimescenes,leavingpoliceonsnowmobilesbe

3、hind.Russianpolicechasingthecriminalstoldthenewspaperthattheirsnowmobilescanbreakdownandrunoutofgas—unlikereindeer.IrinaPimkinafromtheregion'sInteriorsaid：“Ofcoursewehavesnowmobilesinservice,butoneshouldunderstandthatamachineisamachine.”“Asnowmobilecanbreakdownorgetstuckinthetundra,butthed

4、eerwillrunatalltimes.”Theforcebelievesthattheanimalswillgivethemanedgeinpolicingtheremoteareaandtheyhavebeenaskingforreindeerrecruitsfortwoyears.Reindeer'shoovesareuniquebecausetheyadapttoseasonalweatherconditions,MotherNatureNetworkreported.Whengroundissoftinthesummer,thebottomsoftheanima

5、l'shoovesactlikespongestoprovidetraction(牵引力)，whiletherim(边缘)ofthehoofbecomesexposedinthewinter.Thismeansthattheycancutintoiceandsnowtostopthemfromslipping.Theyevenusethemtodigdownthroughhardsnowsotheycanfindtheirfavoritefood—alichenknownasreindeermoss.Thevisionofreindeermayalsooutperforma

6、snowmobile'slights,becausetheanimalscanseeultravioletlight.Snowreflectsupto90percentofUVlightandthisabilityhelpstheanimalstoseeclearlyindimlightingandlandscapesthatarelargelywhite,wheremayobjectsblenduntothelandscape.Thingslikefurandurine,forexample,showupclearlyinultravioletlight,compared

7、towhathumanssee.AstudybyUniversityCollegeLondon(UCL)revealedin2011thatreindeercanseelightwithwavelengthsasshortas320nanometers(nm),considerablybelowthehumanthresholdof400nm.ResearchersfromtheUniversityofTromsdiscoveredthattheeyesofreindeerchangecoloraccordingt