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1、Task4【答案】1)Themayfly.Afewhours.2)Theyjustdotwothings:findingamateandproducingyoung.3)Wecouldjudgebyitsgrowthrings.4)Itwaskeptfor152years.Task5【答案】A.Peoplehavedifferentopinionsonusinganimalsforresearch.B.1)fora.wastriedfirstonanimals.b.isdependentonc.usingunwantedanimals.2)againsta.sufferb.unnecessar
2、yc.thesamerights3)a.cellcultureb.computermodeling.Task6【答案】A.1)No.2)Becausezooofficialswanthimtoproducecubswithanotherfemaletiger,sotheydon’twanthimtobecometoointerestedinthisfamily.B.1)fourmonths2)13kilograms3)horsemeat,theirmother’smilk.4)theNationalZoo’sWebsiteC.1)c,2)c,3)bTask7【答案】A.1)Catshavebe
3、enmorepopular,becausetherearemorepetcatsinAmericanhomes.2)About8,000years3)TheyprobablyarrivedintheUnitedStatesfromEurope.4)No.B.1)a)foodespeciallypreparedforcatsb)otherequipmentc)withimagesofcatsd)inspecialburialgrounds2)a)pleasureb)carec)beingaloned)independentC.1)F,2)F,3)T,4)F,5)FTask8【答案】LittleS
4、tevehasapetrabbit,Bunny.Heplayswithiteverydayafterschool.OnedayhismotherseesthatherlittleboyisholdingBunnybytheears.Fromtimetotimehegivesthepoorrabbitanangryshakeandsays:“Howmuchistwoplustwo?” “Steve,”sayshismother,“WhydoyoutreatyourpoorlittleBunnythatway?” “Well,”explainsSteveangrily,“Ourteachers
5、aysthatrabbitsmultiplyveryquickly,butthisdummycan’tevenadd.”Task9【答案】Mostmammalsliveonland,butnotallofthem.Millionsofyearsago,somemammalswentbacktotheseaandlivedthere.Thelegsoftheseanimalsdisappeared,andafteralongtimetheylookedlikefish.Theseanimalsbecamewhalesanddolphins.Whalesanddolphinsarestilllik
6、eothermammalsinmanyways.Theyarewarm-bloodedandtheybreatheair.Theyalsohavebigbrains.Thatiswhytheyaremoreintelligentthanfish.Whaleshavethebiggestbrainsintheworld.Theirbrainisbiggerthanthebrainofahumanbeing.Unit3Task1【答案】1)Herhobbyissky-diving.Shejumpsfromanaeroplaneandfallsthroughtheair.Sheopensherpar
7、achuteonlywhensheisveryclosetotheground.2)Hewantstoorganizeaband.3)Towin.Task2【答案】A.1)F,2)F,3)T,4)TB.Shewastaughtwheretositintheaeroplane,howtojumpout,howtoguidetheparachute,andhowtolandsafelyonthegro
