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1、2014年雅思阅读模拟试题(1) Whenwasthelasttimeyousawafrog?Chancesare,ifyouliveinacity,youhavenotseenoneforsometime.Eveninwetareasonceteemingwithfrogsandtoads,itisBECominglessandlesseasytofindthoseslimy,hoppingandsometimespoisonousmembersoftheanimalkingdom.Allovertheworld,and
2、eveninremotepartsofAustralia,frogsarelosingtheecologicalbattleforsurvival,andbiologistsareatalosstoexplaintheirdemise.Areamphibianssimplyoversensitivetochangesintheecosystem?Coulditbethattheirrapiddeclineinnumbersissignalingsomecomingenvironmentaldisasterforusall?
3、Thisfrighteningscenarioisinparttheconsequenceofadramaticincreaseoverthelastquartercenturyinthedevelopmentofoncenaturalareasofwetmarshland;homenotonlytofrogsbuttoallmannerofwildlife.However,asyet,therearenoobviousreasonswhycertainfrogspeciesaredisappearingfromrainfo
4、restsinAustraliathathavebarelybeentouchedbyhumanhand.Themysteryisunsettlingtosaytheleast,foritisknownthatamphibianspeciesareextremelysensitivetoenvironmentalvariationsintemperatureandmoisturelevels.ThedangeristhatplanetEarthmightnotonlyloseavitallinkintheecological
5、foodchain(frogskeeppopulationsofotherwisepestilentinsectsatmanageablelevels),butwemightbeincreasingouroutputofairpollutantstolevelsthatmayhavealreadybecomeirreversible.Frogscouldbeinadvertentlywarningusofacatastrophe. Anexampleofaspeciesoffrogthat,atfarasisknown,h
6、asbecomeextinct,istheplatypusfrog.Likethewell-knownAustralianmammalitwasnamedafter,itexhibitedsomeverystrangebehaviour;insteadofgivingbirthtotadpolesinthewater,itraiseditsyoungwithinitsstomach.Thebabyfrogswereactuallybornfromoutoftheirmother'smouth.Discoveredin1981
7、,lessthantenyearslaterthefroghadcompletelyvanishedfromthecrystalclearwatersofBooloumbaCreeknearQueensland'sSunshineCoast.Unfortunately,thisfreakofnatureisnottheonlyfrogspeciestohavebeenlostinAustralia.Sincethe1970s,nolessthaneightothershavesufferedthesamefate. On
8、etheorythatseemstofitthefactsconcernsthedepletionoftheozonelayer,awelldocumentedphenomenonwhichhasledtoasharpincreaseinultravioletradiationlevels
