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