（全国卷）2019届高考英语一轮复习unit2healthyeating课时作业新人教版必修3

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1、Unit2HealthyeatingⅠ.阅读理解ABiologistRobertPitmanandhiscolleaguestrackedorcas，orkillerwhales，andhumpbackwhalesoffthecoastofWesternAustralia.Toresearchfurther，thescientistsattachedatrackertoafemaleorca，whichallowedthemtousesatellitestomonitorhermovements.Theyf

2、ollowedherforsixdays.Duringthattime，theorcaattackedeightyounghumpbackwhales.Duringthesevenattacks，theorcakilledthehumpbackwhalecalf(幼兽)onthreeoccasions.Butthestorydoesn'tendthere.Humpbackwhalesthemselvesarepopularlythoughttobelargebutgenerally，passivecreat

3、ures.Pitman'sstudyfindingsmayletpeoplethinkotherwise.Whenchasedbyorcas，humpbackwhalesareknowntotrytooutswimorcas.Theyarethoughttodothisathighspeedsothattheorcascan'tkeepup.Onsomeoccasions，thehumpbackwhalessoughtoutprotection.Theyswamtoshallowwater，nearbyre

4、efs，orevenundertheresearchers'boats.Thesewaysoftenreducedtheattack.Butatothertimes，thehumpbackwhalesdecidedtostayandfight.Astheorcasapproached，themotherhumpbackwouldsometimesmovehercalftoherside，orliftitoutofthewaterusingherheadorflippers.Shealsoblewhugebr

5、eathsofairtodisturbtheorcas，andlungedorchargedatthem，slashing(劈)andslappinghertailandflippers.Perhapsmostsurprisingly，humpbackwhalesalsohaveadult“escorts(护卫队)”thattrytoprotectcalvesthatarenottheirown，joiningthemotherindefendingthesmallerwhale.Theseescortwh

6、aleseitherchargedattheorcas，orplacedthemselvesbetweentheattackersandcalves，slashingtheirtailsandflippers.Despitetheeffortsofthemotherwhalesandescorts，theorcasweremoreoftenthannotsuccessfulintheirattacks.Butthepresenceoftheescortsdidreducehowmanytimesawhale

7、calfwaskilled.[语篇解读]　本文是一篇说明文，主要讲的是科学家使用科学仪器来观察杀人鲸是如何追杀驼背鲸及后者是如何反击和保护幼小的驼背鲸的。1．What'sthepurposeofthescientists'furtherresearch?A．Tokeeparecordofwhales'livinghabits.B．Toobserveorcas'huntinghumpbackwhales.C．Toseewhatlifeordeathbattleswhalesmayface.D．Tofindou

8、tthetechniquesorcasusewhenhunting.解析：细节理解题。根据文章第一段中的“Toresearchfurther...tousesatellitestomonitorhermovements.Theyfollowedherforsixdays.Duringthattime，theorcaattackedeightyounghumpbackwhales...”可知，科学家进行进一步研究的