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十四科普知识类Inappearance,thebirdsofbothsexeslookverymuchalikewithbrownonthebackandcreamandredontheunderside.Theheadissmall，withalargesetoffeathersonthetop,brightredeyes，andblueskin.Itsnearestrelativesarethecommonbirds,cuckoos.Itsmoststrikingfeature，though，isonlyfoundintheyoung.Babyhoatzinshaveaclawontheleadingedgeofeachwingandanotherattheendofeachwingtip.Usingthesefourclaws,togetherwiththebeak(喙)，theycanclimbaboutinthebushes,lookingverymuchlikewhatprimitivebirdsmusthavedone.Whentheyounghoatzinshavelearnedtofly,theylosetheirclaws.DuringthedriermonthsbetweenDecemberandMarchhoatzinsflyabouttheforestingroupsof20to30birds,butinApril，whentherainyseasonbegins，theycollecttogetherinsmallerlivingunitsoftwotosevenbirdsforproducingpurposes.1．Whatisthetextmainlyabout?A.Hoatzinsindryandrainyseasons.B.Therelativesandenemiesofhoatzins.C.PrimitivebirdsandhoatzinsoftheAmazon.D.Theappearanceandlivinghabitsofhoatzins.2．Younghoatzinsaredifferentfromtheirparentsinthat________.A.theylooklikeyoungcuckoosB.theyhaveclawsonthewingsC.theyeatalotlikeacowD.theyliveonriverbanks3．Whatcanweinferaboutprimitivebirdsfromthetext?A.Theyhadclawstohelpthemclimb.B.Theycouldflylongdistances.C.Theyhadfourwingslikehoatzins.D.Theyhadaheadwithlongfeathersonthetop.4．Whydohoatzinscollecttogetherinsmallergroupswhentherainyseasoncomes?A.Tofindmorefood.B.Toprotectthemselvesbetter.C.Tokeepthemselveswarm.D.Toproducetheiryoung本小节结束请按ESC键返回
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