2019届高三英语上学期第三阶段(期中)考试试题

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1、2019届高三英语上学期第三阶段(期中)考试试题（考试时间：100分钟试卷满分：120分）第一部分阅读理解(共两节，满分40分)第一节(共15小题；每小题2分，满分30分)阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。AIthaslongbeenthoughtthatelephantsrelyontheirlargeearsandbathinginriverstostaycoolinhotclimates.Newresearch,however,hasshowedthattheworld'slargestlandanimalshavease

2、crettrickofcontrollingtheirbodytemperatures.Scientistshavelongbeenpuzzledbytemperatureregulation(调节)inelephants.Generally,animalswithlargebodiestendtoholdmoreheatbecause,paredtotheirsize,theyhaveasmallsurfaceareaforheattoescapefrom.Elephants,withtheirheavyweightframes,wouldappeartob

3、eatadisadvantageintheheatoftheirAfricanandAsianhabitats,especiallybecausetheyhavethickfurtoprotectthemfrombushesandtrees.Scientiststhoughtthatthesecreatures,whichweighupto13tonswhenfully-grown,growlargeearstohelpthemstaycool.Theskinontheearsisthinner,sobloodwhichflowsintothemcoolsdo

4、wnmoreeasily.ButfindingsbyresearchersattwouniversitiesinViennahaveshowedthatelephantsarealsoabletocooldownbyincreasingthebloodflowtoskinpatches(斑)inotherpartsoftheirbodies.TheresearchersstudiedsixAfricanelephantsatViennaZooastheymovedbetweenoutdoorandindoorenvironmentstoseehowthetem

5、peratureontheirskinsurfacewouldchange.Theyfoundupto15“hotspots”alloveranelephant'sbodysurface,inadditiontolargepatchesontheears.Thestudyshowshowthesepatchesexpandastheairtemperatureincreasesandmorebloodflowsnearertotheskinsurface.Otherexperimentsshowthatelephantsinthewildusethesame“

6、windows”tocontroltheirbodytemperature.Elephantshavetwoadditionalwaystostaycool:flapping(拍打)theearsandbathing.Togetherwiththesetricks,theskinhotspotsallowtheanimalstokeeptheirbodytemperaturealwaysatabout36degrees—onedegreelessthanhumans'.1．Whatcanweknowabouttheelephants?A．Theyhavethi

7、ckfurtoprotectthem.B．TheyliveincoolareasinAfricaandAsia.C．Theycanweighupto3tonswhenfully-grown.D．Theyareafraidofwaterandrivers.2．Thefunctionofthethinnerskinonelephants’earsisto________.A．controltheirbodytemperatureB．helpholdmoreheatC．driveawayinsectsD．keepsensitivehearing3．Thenewres

8、earch________.A．stu