Twooutofeveryfivespeciesontheplanetthathavebeenestimatedbyscientistsfaceextinction.ThisfigurecomesfromthelatestWorldConservationUnionRedListofEndangeredSpeciespublishedthisweek.Ina

　　Twooutofeveryfivespeciesontheplanetthathavebeenestimatedbyscientistsfaceextinction.ThisfigurecomesfromthelatestWorldConservationUnionRedListofEndangeredSpeciespublishedthisweek.

　　Inall16119animalandplantspeciesareindangerofextinction.“Fromthepoles(地球的两个极点)tothedesertspecieslossisincreasingnotslowingdown”saysIUCNdirector-generalAchimSteiner.Themaincauseaseverispeoplebothdirectlyandindirectly.Whilehuntingandhabitat(栖息地)losscontinuetohaveaseriouseffectonspeciesnumbersglobalwarmingisanotherthreat.

　　Inthepolarregions(极地)，thesummerseaicethatpolarbearsdependonisrapidlydisappearingandthelatestestimatessuggestthattheicewillbereducedatleastbyfiftypercentinareaoverthenextcentury.AlthoughpolarbearsarestrongswimmersyetlargenumbersofthemwillstarveordrownasglobalwarmingmeltstheArctic’sicesheets.Theworld’sdesertsmaybeexpandingbuttheanimalsthatliveinandaroundthemarenotfaringwell.It’sparticularlydifficultfortheendangeredspeciesoftheextremehabitattorecovertheirnumbers.Meanwhileourincreasingdemandforfishandwaterisplacingthespeciesinriversandoceansingreatdanger.Asshallow-waterfishstocksgetreducedfishermen’sdroppingnetsandlinesintodeeperwatersaretakingtheirtollonspeciesthere.

　　“Thistrendcan’tbestopped.Environmentalistsalonecannotsavetheworld’sspeciesindanger”saysSteiner“butconservation(保护)canwork.Itmustbecometheresponsibilityofeveryonetoact”.

　　1Allthefollowingstatementsarethecausesofanimalextinctionexcept______.

　　　A.huntingandhabitatloss

　　　B.increasingdemandforfishandwater

　　　C.theexpandingofworld’sdeserts

　　　D.globalwarming

　　2.AccordingtothepassagewhichoffollowingstatementsisTRUE?

　　　A.Onlythespeciesofthepolesanddesertsarefacingextinction.

　　　B.Asaresultoftheglobewarmingpolarbearswillgetmorefood.

　　　C.Fishermen’sfishingindeepoceansincreasesthetollofspecies.

　　　D.Itwillnottakealongtimeforspeciesofextremehabitattorecovertheirnumber.

　　3.What’sthebesttitleofthepassage?

　　　A.SeriousEffectsofGlobalWa