2021高考英语一轮复习课时作业21Unit21HumanBiology北师大版选修7.doc

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1、课时作业21　Unit21　HumanBiology课时练(一)　阅读理解·组块专练——练速度(限时：35分钟)阅读理解(共两节，满分40分)第一节　(共15小题；每小题2分，满分30分)阅读下面短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。A[2020·湖北省高考模拟]Withitssnowcoveredmountainsandavarietyofwildlife,YellowstoneNationalParkisoneofthescenictreasuresoftheUnitedStates.Locate

2、dprimarilyinWyoming,theparkhostsmillionsofvisitorseveryyear.Ifyouplantotravelwithinthepark,keepinmindtheadvicefromtheNationalParkService.SeasonalTravelTravelvariesvastlyfromseasontoseason.Roadsaregenerallyopeninthesummerexceptforcasesofrockormudslides,wildfires,a

3、ccidentsorroadconstruction.Earlysnowsinthefallcancausesomeroadstoclosetemporarily.Inthewinteralmostallroadsareclosedtomotorvehicles,butsnowmobilesandothersnowvehicleswithtracksareallowed.RoadsbegintoopeninthespringbythelatterpartofAprilbutmaycloseifsnowfallcontin

4、ues.DrivingTimeGrandLoopRoadisthemainroadthroughYellowstoneNationalPark,anditpassesbymostofthemajorattractions.TheseincludeOldFaithful,YellowstoneLakeandtheGrandCanyonofYellowstone.ThemaximumspeedlimitontheGrandLoopis45milesperhour,butthespeedlimitdropsduringsome

5、ofthewindingandtwistysectionsofthisnarrowroad.Allowyourselfatleasttwodaystofullytraveltheloopduetothesizeoftheparkandoccasionallyheavytraffic.SafetyAwarenessBuffalooftenblocktheroadsintheparkastheymigratethroughthefields.Ifaherdistravelingacrosstheroadyouareon,yo

6、ucaneitherwaitforthemtopassorfindanalternativeroute.Ifyougetoutofyourvehicle,youshould-18-stayatleast25yardsfromanybuffalo(and100yardsormoreawayfrombearsandwolves).Buffaloareparticularlyunpredictableandchargepeopleatspeedsupto30mph.Youcantakeyourbicycleonanypubli

7、croadsandroutesdesignedforbikes,butbicyclesarenotallowedontheparkroadswhicharenarrowwithfewshoulders.Elevationsrangefrom5,300to8,860feet.TheNationalParkServicerecommendsthatcyclistswearhelmetsandnoticeableclothing.1．WhatisTRUEabouttravelingintheYellowstonePark?A．

8、Roadswillstayopeninspiteofemergency.B．Trafficjamisactuallyararething.C．Thedrivingspeedontheroadcanbe50mph.D．Motorvehiclesareallowedinthewinter.2．Whatsafetyadvi