阅读理解
Afteralongperiodofstudiesscientistsareuncoveringsurprisingnewfindingsaboutdolphins(海豚).Theybelievethatdolphinsdo“talk”toeachotherwhistling“names”amongthemselvesandothersintheirgroup.Theyhelponeanotherwhenintroublelikebatstheyusesoundwavesto“see”.
Dolphinslovetomimic(模仿).Ifweswimonourbackstheydotoo.Ifwedivetheyfollow.Onceatrainerblewapuffof(一阵)cigarettesmokeagainstthewindowofanobservationtank(箱)ayoungdolphinsuddenlyswamtoitsmothernursedamomentandspitoutacloudofmilkagainsttheglass.
Itisevenmoresurprisingthatthatdolphinsareabletounderstandsighlanguage.OneofHerman'sdolphinshasmasteredmorethan50signwords.Andtheycanalsomimicthesignaturesofothers.Nowscientistsarelearninghowdolphins“speak”toeachother.
Dolphinshelponeanother.Whenbirth－givingtakesplacefemalegathertokeepoffsharks.Laterwhilethemotherlooksforfoodtheytakecareoftheyoungdolphinswimmingincircle.
Dolphinsreachouttousinastonishingways.Whatwouldtheworldbelikewithoutthem?
1．Tothebestofourknowledgedolphinsare________.
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A．surprisingfish
B．humanman'sfriends
C．intelligentmammals
D．interestinganimals
2．Inthesecondparagraph“nursed”means________.
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A．broughtthemothersomethingtoeat
B．suckedmilkfromthemotherdolphin
C．askedtobetakencareof
D．gavesomemilktoher
3．Whatwasthedolphindoingwhenitsuddenlyswamtoitsmother?Itwas________.
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A．havingalittlefun
B．divingintothedeepsea
C．playingwiththetrainer
D．copying“smoking”
4．Whichofthefollowingdoyouthinkismorereasonable?
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A．Weareintheearlystageoflearningabouttheanimals.
B．Wehavelittledifficultyinunderstandingdolphins.
C．Manwillbeabletotalkfreelytodolphinsinthenearfuture.
D．Signlanguageistheonlywaytomakedolphinsunderstandus.
5．Theunderlineword“they”inthefirstparagraphrefersto________.
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