資源描述：
《from sleeping standing up to shutting down half of their brain, 閱讀理解答案》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫。
1、Fromsleepingstandinguptoshuttingdownhalfoftheirbrain,閱讀理解答案 閱讀理解Fromsleepingstandinguptoshuttingdownhalfoftheirbrain,animalshavesomestrangesleeping.Nowsomeofthesemoreunusualhabitshavebeenshowedinareport. Thelittlebrownbatismostlyactiveatnightbutitneedsalongperiodofsleep.Itusually
2、sleepsforaroundhoursaday.Thislongperiodofsleepisthoughttobeawayofsavingenergyandmeanstheyonlyhuntforafewhourseachnightwhentheirinsectprey(獵物)areavailable. Incontrast,giraffescangoweekswithoutsleepandwhentheydograbsomesleep,it’sneverformorethanfiveminutes.Thisisbecausebeinglargeand
3、slowmovinggiraffeseasilygetattacksfromhunters.Therefore,theycan’tsleepforlongperiods.Adultgiraffessleepstandingupinshortburstsbutkeepwatchingontheiryoung. However,otheranimalscanswimorflywhilesleeping. Dolphinsandwhalessleepwhilekeepinghalfoftheirbrainawake,sotheydon’tdrown.Theme
4、thodisknownas“l(fā)ogging”andith asbeenobservedinbottlenosedolphins,whichkeephalftheirbrainalowlevelofawareness.Thisallowsthedolphintokeepenoughconsciousnesstocarrybreathingthroughitsblowhole. Whileseaotters(海獺)aredifferentfromdolphinswhiletheysleep,theyformrafts(漂流團)sotheydon’tmov
5、eawayfromeachother.Thecreaturesusuallyholdhandsorpawswhentheysleep,andtypicallyeat,sleepandrestwhilefloatingingroupscalledrafts. Migratingbirdssleepwhileflying,withsomedrinkingandnappingduringlongjourneysthatlastforsixmonths.Scientistsrecentlyhavefoundthatmigratingbirds,suchastheA
6、lpineswift,canflyfor200dayswithoutstopping. 28.Whatcanbeinferredaboutthelittlebrownbats A.Theyareanimalsthatarelackofenergy. B.Theyspendabout6hourshuntingatnight. C.Theyaretheliveliestcreaturesatnight. D.Theyusuallycatchinsectsintheopenair. 29.Theunderlinedpart“Themethod”inPa
7、ragraph5proba blyrefersto______. A.sleepingwithhalfofthebrainawake B.longandextrasleepindolphin’slife C.breathingthroughtheblowholes D.goodconditionsduringsleep 30.Whatcanweknowfromthepassage A.Giraffessleeponlyfiveminuteseverynight. B.Dolphinsandwhalessleepwiththeirnoseo
8、pen. C.Seaottersoftenslee
