阅读理解AAlongtheriverbanksoftheAmazonandtheOrinocotherelivesabirdthatswimsbeforeitcanfly,flieslikeafatchicken,eatsgreenleaves,hasthestomachofacowandhasclaws(爪)onitswingswhenyoung.Theybuildtheirhomesabout4.6mabovetheriver,animportantfeature(特征)forthesafetyoftheyoung.Itiscalledthehoatzin.Inappearance，thebirdsofbothsexeslookverymuchalikewithbrownonthebackandcreamandredontheunderside.Theheadissmall,withalargesetoffeathersonthetop,brightredeyes,andblueskin.Itsnearestrelativesarethecommonbirds,cuckoos.Itsmoststrikingfeature,though,isonlyfoundintheyoung.Babyhoatzinshaveaclawontheleadingedgeofeachwingandanotherattheendofeachwingtip.Usingthesefourclaws,togetherwiththebeak(喙),theycanclimbaboutinthebushes,lookingverymuchlikeprimitivebirdsmusthavedone.Whentheyounghoatzinshavelearnedtofly,theylosetheirclaws.DuringthedriermonthsbetweenDecemberandMarchhoatzinsflyabouttheforestingroupsof20to30birds,butinApril,whentherainyseasonbegins,theycollecttogetherinsmallerlivingunitsoftwotosevenbirdsforproducingpurposes.()1.Whatisthetextmainlyabout?A．Hoatzinsindryandrainyseasons.B．Therelativesandenemiesofhoatzins.C．PrimitivebirdsandhoatzinsoftheAmazon.D．Theappearanceandlivinghabitsofhoatzins.A．theylooklikeyoungcuckoosB．theyhaveclawsonthewingsC．theyeatalotlikeacowD．theyliveonriverbanks()3.Whatcanweinferaboutprimitivebirdsfromthetext?A．Theyhadclawstohelpthemclimb.4\nB．Theycouldflylongdistances.C．Theyhadfourwingslikehoatzins.D．Theyhadaheadwithlongfeathersonthetop.()4.Whydohoatzinscollecttogetherinsmallergroupswhentherainyseasoncomes?A．Tofindmorefood.B．Toprotectthemselvesbetter.C．Tokeepthemselveswarm.D．Toproducetheiryoung.1.选D。考查文章主题大意。纵观全文，文章主要讲的是hoatzin麝雉，这种鸟类的外貌以及生活习性。2.选B。根据第一段hasclaws(爪)onitswingswhenyoung,和第三段可知，hoatzin在幼年期是有爪子的，而长大学会飞之后就没有了。3.选A。关键是primitive“原始的，早期的”的意思。第三段第二句话。4.选D。最后一段最后一句话。BSciencecan'texplainthepowerofpets,butmanystudieshaveshownthatthecompanyofpetscanhelplowerbloodpressure(血压)andraisechancesofrecoveringfromaheartattack,reducelonelinessandspreadall-roundgoodcheer.Itbest.ThosetestedwiththeiranimalfriendshadsmallerchangeinbloodpressureandreturnedMostquicklytobaselineheartrates.Withpetsintheroom,peoplealsomadefewermathmistakesThanwhendoinginfrontofothercompanions.Itseemspeoplefeelmorereleased(放松)aroundPets,saysAllen,whothinksitmaybebecausepetsdon’tjudge.Astudyreportedlastfallsuggeststhathavingapetdognotonlyraisesyourspiritsbutmayalsohaveaneffectonyoureatinghabits.ResearchersatNorthwestermMemorialHospitalspentaYearstudying36fatpeopleandwereputonadiet-and-exerciseprograms;aseparate4\ngroupof56fatpeoplewithoutpetswereputonadietprogram.Onaverage，peoplelostabout11pounds，Or5%oftheirbodyweight.Theirdogsdidevenbetter，losinganaverageof12pounds，morethen15%oftheirbodyweight.Dogownersdidn’tloseanymoreweightthanthosewithoutdogsbut,sayResearchers，gotmoreexerciseoverall–mostlywiththeirdogs–andfounditworthdoing.()1.Whatdoesthetextmainlydiscuss?A．WhatpetsbringtotheirownersB．HowpetshelppeoplecalmdownC．people’sopinionsofkeepingpetsD．Pet’svalueinmedicalresearch()2.Welearnfromthetextthatapersonwithheartdiseasehasabetterchanceofgettingwellif____________A．hehasapetcompanionB．hehaslessstressofworkC．heoftendosementalarithmeticD．heistakencareofbyhisfamily()3.AccordingtoAllen,whydidthepeopledobetterwithpetsaroundwhenfacingstressfultasks?A．Theyhavelowerbloodpressure.B．Theybecomemorepatient.C．Theyarelessnervous.D．Theyareinhigherspirits.()4.TheresearchmentionedinthelastparagraphreportsthatA．peoplewithdogsdidmoreexerciseB．dogslostthesameweightaspeopledid4\nC．dogslikedexercisemuchmorethanpeopledidD．peoplewithoutdogsfoundtheprogramunhelpfulB篇1.选A。考查主题大意。根据首段，很多研究表明，宠物可以降低血压，提高、心脏病恢复的几率，减少孤独感和传播快乐。2.选A。根据第一段，参见上题解析。3.选C。第二段最后一句话，和宠物在一起人们感到更加的放松。4.选A。最后一段最后一句话，虽然狗主的体重没有多大变化，但是却比没有养狗的人得到更多的锻炼，因为是和他们的狗在一起，他们认为很值得。4
