from sleeping standing up to shutting down half of their brain, 阅读理解答案

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1、Fromsleepingstandinguptoshuttingdownhalfoftheirbrain,阅读理解答案　　阅读理解Fromsleepingstandinguptoshuttingdownhalfoftheirbrain,animalshavesomestrangesleeping.Nowsomeofthesemoreunusualhabitshavebeenshowedinareport.　　Thelittlebrownbatismostlyactiveatnightbutitneedsalongperiodofsleep.Itusually

2、sleepsforaroundhoursaday.Thislongperiodofsleepisthoughttobeawayofsavingenergyandmeanstheyonlyhuntforafewhourseachnightwhentheirinsectprey(猎物)areavailable.　　Incontrast,giraffescangoweekswithoutsleepandwhentheydograbsomesleep,it’sneverformorethanfiveminutes.Thisisbecausebeinglargeand

3、slowmovinggiraffeseasilygetattacksfromhunters.Therefore,theycan’tsleepforlongperiods.Adultgiraffessleepstandingupinshortburstsbutkeepwatchingontheiryoung.　　However,otheranimalscanswimorflywhilesleeping.　　Dolphinsandwhalessleepwhilekeepinghalfoftheirbrainawake,sotheydon’tdrown.Theme

4、thodisknownas“logging”andith　　　　asbeenobservedinbottlenosedolphins,whichkeephalftheirbrainalowlevelofawareness.Thisallowsthedolphintokeepenoughconsciousnesstocarrybreathingthroughitsblowhole.　　Whileseaotters(海獭)aredifferentfromdolphinswhiletheysleep,theyformrafts(漂流团)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