高考英语专题冲刺 专题19 书面表达之概要写作（含解析）.doc

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1、专题卷十九书面表达之概要写作1．概要写作阅读下面短文，根据其内容写一篇60词左右的内容概要。Withglobalwarmingandmeltingice,itisn’teasybeingapolarbearanymore.Somestudieshavepredictedthatpolarbearscoulddieoutbytheendofthecentury.Thegoodnewsisnotallresearchersthinkthebearsareabsolutelydisappearing.Scientistsat

2、theAmericanMuseumofNaturalHistory(AMNH)havepublishedanewpaperindicatingthatthingsmightnotbeasbadforpolarbearsassomescientistsexpect.Tounderstandthereasonfortheresearchers’cautiousoptimism,wemustfirstunderstandthefactorsthatarethreateningthepolarbear’sexistence.P

3、olarbearsconsumeadietofmainlyyoungseals.Inordertohunttheseseals,polarbearsneedtorestatthetopofseaice---thesameicethatisincreasinglymeltingformostoftheyearthankstoclimatechange.Inanother50years,expertsexpectthattheArcticwillbetoowarmforseaicetoformforhalfoftheyea

4、r,leavingpolarbearswithoutareliablefoodsourceandinseriousdangerofstarvation.Asitturnsout,alternativefoodsourcesforthepolarbearsaren’tcompletelyoutofthequestion.Foraslongasbiologistshavetailedaftertheanimals,they’veseenpolarbearseatinganimalsfoundonlandlikecaribo

5、u(驯鹿)andsnowgeese---aswellasthesnowgeese’seggs.Canpolarbearsactuallysurviveoffthesealternativefoodsourcesforlongperiodsoftime?Tofigurethisout,researcherscalculatedthenutrientsthatacaribouandsnowgeesedietwouldprovide.Theyfoundthatevenadultmalepolarbearswouldbeabl

6、etoobtainmorecaloriesthantheywouldburninhuntingthesemeals.Moreover,thefoodwouldprovidethefoodnecessarytoavoidstarvationduringthesummermonths.Unfortunately,notallpolarbearshavetendedtoseekfoodonland.Thatsaid,theresearchersexpectthatnecessitywouldpushmorepolarbear

7、stohuntonlandtoavoidstarvation.Theyalsoexpectthatthebearscouldlearnfromtheirfellowbearshowtohuntonlanduntilthepracticebecomessecondnature.____________________________________________________________________________________________________________________________

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