2019-2020年高考英语大一轮复习Unit4Wildlifeprotection课时作业新人教版必修(I)

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1、2019-2020年高考英语大一轮复习Unit4Wildlifeprotection课时作业新人教版必修(I)Ⅰ.阅读理解[xx·湖北八校联考]Researchersfoundthatwomenwhohadgivenbirthmighthaveareducedriskofdeathfromseveralmonconditionsthanthosewhohadnot，accordingtoastudyreleasedFridaybytheImperialCollegeLondon(ICL)．Thestudy，ledbyICLresearch

2、ers，waspublishedinthejournalBMCMedicine.Itinvestigatestheassociationbetweenthesocalledreproductivefactors—suchashavingchildrenandbreastfeeding—andawoman'sriskofdeath.Researchersanalyzeddatafrom322,972womenacross10countries，includingtheUK，France，GermanyandSweden，withanaver

3、ageageof50.Eachwomanwasfollowedforanaverageof12.9years.Duringthisperiod，therewere14,383deathsoverall，whichincluded5,938deathsfromcancerand2,404deathsfromcirculatorysystemdiseases，accordingtothestudy.Theteamparedreproductivefactorswiththeriskofdeathfromseveralmonconditions

4、，suchasbreastcancer，strokesandheartdiseases.Theresearchersfoundthatwomenwhohadgivenbirthhada20percentreducedriskofdeaththanthosewhohadnot.Itwasalsofoundthattherewasareducedriskofdeath(8percent)inwomenwhohadbreastfedparedtothosewhohadnot.Theriskofdeathfromcancerwaslowerint

5、hosewhohadgivenbirthparedtothosewhohadnot.Withinthisgroup，theriskwasreducedevenfurtherinwomenthatgavebirthtotwoorthreechildreninparisontothosewhohadonlyonechild.“Hormonalmechanismsmayexplainthelowerriskofdeaththatweobservedwithbreastfeeding，andhavinggivenbirth，asthesefact

6、orsareassociatedwithchangesinhormonelevels，”saidDrMelissaMerrittfromICL，wholedthestudy.1．Accordingtothepassage，theriskofdeathfromcancerislowerinwomenwho________.A．havegivenbirthtonochildB．havegivenbirthtoonechildC．havegivenbirthtomorethanonechildD．havebreastfed2．According

7、totheresearch，ifawomanhasgivenbirthandbreastfed，herriskofdeathwilldecreaseby________.A．20%B．28%C．12%D．16%3．Whichofthefollowingmightbeoneofthefindingsoftheresearch?A．Severalmonconditionsleadtowomen'sdeath.B．Reproductivefactorsareassociatedwithchangesinhormonelevels.C．Women

8、whohavegivenbirthlivelongerthanthosewhohavenot.D．Havingchildrenmightreducewomen'sriskofdeathfrom