2019-2020年高考英语专题冲刺专题19书面表达之概要写作含解析

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1、2019-2020年高考英语专题冲刺专题19书面表达之概要写作含解析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.Thegoodnewsisnotallresearchersthinkthebearsareabsolutelydisappear

2、ing.ScientistsattheAmericanMuseumofNaturalHistory(AMNH)havepublishedanewpaperindicatingthatthingsmightnotbeasbadforpolarbearsassomescientistsexpect.Tounderstandthereasonfortheresearchers’cautiousoptimism,wemustfirstunderstandthefactorsthatarethreateningthepolarbear’

3、sexistence.Polarbearsconsumeadietofmainlyyoungseals.Inordertohunttheseseals,polarbearsneedtorestatthetopofseaice---thesameicethatisincreasinglymeltingformostoftheyearthankstoclimatechange.Inanother50years,expertsexpectthattheArcticwillbetoowarmforseaicetoformforhalf

4、oftheyear,leavingpolarbearswithoutareliablefoodsourceandinseriousdangerofstarvation.Asitturnsout,alternativefoodsourcesforthepolarbearsaren’tpletelyoutofthequestion.Foraslongasbiologistshavetailedaftertheanimals,they’veseenpolarbearseatinganimalsfoundonlandlikecarib

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

6、obtainmorecaloriesthantheywouldburninhuntingthesemeals.Moreover,thefoodwouldprovidethefoodnecessarytoavoidstarvationduringthesummermonths.Unfortunately,notallpolarbearshavetendedtoseekfoodonland.Thatsaid,theresearchersexpectthatnecessitywouldpushmorepolarbearstohunt

7、onlandtoavoidstarvation.Theyalsoexpectthatthebearscouldlearnfromtheirfellowbearshowtohuntonlanduntilthepracticebeessecondnature.__________________________________________________________________________________________________________________________________________

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