【课标通用】2020版高考英语大一轮复习 课时作业必修二 Unit 4 Wildlife protection含答案.doc

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1、课时作业(九)Ⅰ.阅读理解[2017·湖北八校联考]Researchersfoundthatwomenwhohadgivenbirthmighthaveareducedriskofdeathfromseveralcommonconditionsthanthosewhohadnot，accordingtoastudyreleasedFridaybytheImperialCollegeLondon(ICL)．Thestudy，ledbyICLresearchers，waspublishedinthejournalBMCMedicine.Itinvestigatestheassociation

2、betweenthesocalledreproductivefactors—suchashavingchildrenandbreastfeeding—andawoman'sriskofdeath.Researchersanalyzeddatafrom322,972womenacross10countries，includingtheUK，France，GermanyandSweden，withanaverageageof50.Eachwomanwasfollowedforanaverageof12.9years.Duringthisperiod，therewere14,383deaths

3、overall，whichincluded5,938deathsfromcancerand2,404deathsfromcirculatorysystemdiseases，accordingtothestudy.Theteamcomparedreproductivefactorswiththeriskofdeathfromseveralcommonconditions，suchasbreastcancer，strokesandheartdiseases.Theresearchersfoundthatwomenwhohadgivenbirthhada20percentreducedrisk

4、ofdeaththanthosewhohadnot.Itwasalsofoundthattherewasareducedriskofdeath(8percent)inwomenwhohadbreastfedcomparedtothosewhohadnot.Theriskofdeathfromcancerwaslowerinthosewhohadgivenbirthcomparedtothosewhohadnot.Withinthisgroup，theriskwasreducedevenfurtherinwomenthatgavebirthtotwoorthreechildrenincom

5、parisontothosewhohadonlyonechild.“Hormonalmechanismsmayexplainthelowerriskofdeaththatweobservedwithbreastfeeding，andhavinggivenbirth，asthesefactorsareassociatedwithchangesinhormonelevels，”saidDrMelissaMerrittfromICL，wholedthestudy.1．Accordingtothepassage，theriskofdeathfromcancerislowerinwomenwho_

6、_______.A．havegivenbirthtonochildB．havegivenbirthtoonechildC．havegivenbirthtomorethanonechildD．havebreastfed2．Accordingtotheresearch，ifawomanhasgivenbirthandbreastfed，herriskofdeathwilldecreaseby________.A．20%B．28%C．12%D．16%3．Whichofthefollowingmightbeoneofthefindingsoftheresearch?A．Severalcommon

7、conditionsleadtowomen'sdeath.B．Reproductivefactorsareassociatedwithchangesinhormonelevels.C．Womenwhohavegivenbirthlivelongerthanthosewhohavenot.D．Havingchildrenmightreducewomen'sriskofdeathfromsomediseases.答案：[解题导语]研究表