Winteriscoming.It'stimeforthearcticgroundsquirrel(北极松鼠)togetherundergroundhomeready.WinterislongandcoldinnorthernCanada.Plantscan'tgrowsotherearenoleavesorgrassforanimalstoeat.Theymustfindotherwaystolive.Thearcticgroundsquirrel“sleeps”thewinteraway.
①Formonthsthegroundsquirrelhasbeeneatinglotsofseedsmushroomsandberries.Nowsheisfat.Theextrafatwillkeepheralivethroughthewinter.Atlastshecrawlsthroughatunnel(隧道)intothenestshehasmade.Shecurlsupwrapshertailaroundherselfandgoesto“sleep.”Onlyshewon’treallybesleeping.Shewillbehibernating.
②Thegroundsquirrel'sbodyisusuallyaswarmasyours.Whenshehibernatesherbodybecomescolderthanice.Butshedoesn’tfreeze.Herheartbeatsjustoneortwotimeseachminute.Shewilltakeonlyaboutthreebreathseachminute.Thesechangesinthegroundsquirrel'sbodyletherlivethroughthewinter.Whenshehibernatesshedoesn’tneedmuchfood.
③Thegroundsquirrelwillnotstayinhibernationallwinter.Herbodywarmsupandbecomesactiveforafewhoursonceeveryfewweeks.Overthewintertheseactivetimesuseupmorethanhalfoftheenergythatsheworkedsohardtostore.Whydoesshedothis?Scientistsaren’tsure.Somethinkarcticgroundsquirrelsmustwarmupincasetheirbodiesneedtofightoffanygermsthatwouldmakethemsick.
根据短文内容,完成下面的任务。
1.根据上下文,画线单词hibernating的汉语意思是。
2.用temperature写出画线句子的同义句。
3.Theunderlinedword“changes”inparagraphthreecomesfromhisbody'sand.
4.从下面A-D四个选项中为每一段选择恰当的主旨句,其中有一项多余。
①②③
A.ColderThanIce B.NotReallySleeping C.Storefood D.StayingWell
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