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1、2013高考英语二轮（阅读理解）珍品训练（05）及答案（******）Bothwarm-bloodedandcold-bloodeddesertanimalshavewaystoescapethedesertheat.Warm-bloodeddesertanimals,suchasratsandmice,restduringtheday,oftenstayingincoolundergroundburrows.Atnighttheysearchforfood.Animalsthatareoutduringtheday,suchas
2、cold-bloodedlizardsandsnakes,areactiveonlyforshortperiods.Astheirbodytem-peraturerises,thesereptilesmoveintotheshadeinordertocooldown.Intheearlyevening,whenthesungrowsweaker,thereptilesbecomemoreactiveandbegintheirsearchforfoodagain.Gettingenoughwatertosurviveisamajor
3、problemforalldesertanimals.Somedesertanimals,likedesertbirds,managetofindwaterholes.Otherdesertanimals,suchasthekangarooratandtherelatedjerboa,getwateronlyfromthefoodthattheyeat.Becausetheseanimalseatmainlydryseeds,theymustsurviveonatinyamountofwater.Mostdesertshaveon
4、lyasmallnumberoffrogsandtoadsbecausetheseanimalsmustbenearwatertosurvive.Yeteventhesecreatureshaveadapted(适应)todesertconditions.Whensmallamountsofwatercollectintemporarystreams,thedesert-livingfrogsandtoadsbecomeactive.Afterarainfall,theylaytheireggs.Theeggsgrowintota
5、dpolesinafewdaysandintoadultsinjustfourweeks,whenthepuddles(7](t7i;)dryup,theadultfrogsortoadsdigintotheground.Theirmetabolism(新陈代谢)slows,andtheystaybeneaththegrounduntilthenextrain,whichmaybeasgoodasayearaway.Untilthen,theirbodilyactivitiescontinueatareducedrate.Thec
6、amel--oftencalledtheshipofthedesert--isoneofthemostsuccessfuldesertanimals.Camelscangoforlongpe-riodswithoutwater,buteventuallytheymustdrink.Whenwaterbecomesavailabletothemafteralongdrought,theymaydrink95litersofwaterormore.Whenwaterisnotavailable,whathelpscamelssurvi
7、vethedesertheatisthefatstoredintheirhumps(驼峰).Acamel'shumpcontainsabout12kilogramsoffat.Fatisrichinhydrogen.Asthefatisdigested,hydrogenfromthefatcombineswithoxygenintheairthatthecamelbreathes.TheresultisH20,orwater.Eachkilogramoffatthatacameldigestsproducesaboutaliter
8、ofwater.1.Desertanimalsareusuallymoreactiveatnightbecause.A.itiscooleratnightB.itiseasiertofindwaterC.theylikethedarkD.theya
