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阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

Tensofthousandsofbabypenguins(企鹅)facestarvationaftertwogianticebergsbrokeofftheAntarcticicesheetandblockedtheirparents'waytofeedingareas.

AdelieandemperorpenguinsnestingontheRossIslandarenowforcedtowalklongdistancesovertheicebergstoobtainfoodfortheirchicks,bornduringtheNovember-Decemberbreeding(繁育)season.

“Thepenguinsarehavingtowalk50kmfurtherthanusualtoreachthesea,”saidDeanPeterson.Theflightlessbirdstravelonlandatjustonetotwokmperhour.

Theproblemcouldhalve(平分)thechicksurvival(存活)rateatthethreeAdeliepenguincoloniesonRossIslandestimatedat130,000breedingpairs.InallAntarotica,thereisanestimatedthreemillionAdeliepenguinbreedingpairs.

Around12,000breedingpairsofemperorpenguins,thelargestpenguinspeciesatuptofourfeettall,arealsoaffected.

TheicebergsbrokefromthevastRossIceshelf,southofNewZealand,inMarch2000andarenowsandwichedbetweenRossIslandandFranklinIsland,93milestothenorth.

ScientistPetersonestimatedthatpenguinsweretakingdaystomaketheroundtriptotheseatofish,andthenbacktotheirneststoregurgitate(反刍)foodfortheirchicks.

“Atthatpointtheywerequitetiredandprobablydon'thavemuchtoregurgitate,”hesaid.Penguinsalreadyhavelongoddsonreachingadulthood,withonly10percentsurvivingbeyondadolescence(青春期).

“Weareprobablylookingathalvingthatagainwearesittingdownatmaybethefivepercentrate,”Petersonsaid,addingsomepenguinsalreadyappearedtobeleavingtheRossIslandtobreedelsewhere.

Penguinscomeashoretobreedandthentakeitinturnstoleavethenesttofetchfishandotherseafoodtofeedtheiryoung.

ResearcherssaylargeblocksoftheAntarcticicesheetarebreakingoffforseveralreasons,includingglobalwarming.

EmperorandAdeliepenguinsarelimitedtoAntarctica.Theemperorsweighupto66poundswhileAdeliepenguinsaremuchsmaller,weighingaround11pounds.

1．Afterthelongtrip,themotherpenguins________.

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A．aretootiredtofeedtheiryoung

B．can'tbringupmuchtofeedtheiryoung

C．aretoohungrythemselves