【阅读理解Afteralongperiodofstudiesscientistsareuncoveringsurprisingnewfindingsaboutdolphins(海豚).Theybelievethatdolphinsdo“talk”toeachotherwhistling“names”amongthemselvesandothersinthe】

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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