Unit9 Lesson3 課后習題講解課件-高中英語北師大版（2019）選擇性必修第三冊

UNIT9HumanBiologyLesson3EpidemicsExplained課后習題講解

課本69頁4.

ChenXiisintroducingthehistoryofepidemics.Completehisspeechusingthecorrectformofthewordsandphrasebelow.

variationwidespreadopposetopose

infectiouslungtrialglobeestimateAnepidemicisan1._________________diseasethatspreadsrapidlytoalargenumberofpeoplewithinashortperiodoftime.EpidemicshavebeenoccurringaslongashumanshavebeenonEarth.Someepidemicsare2_______________ofpreviousviruses.infectious

variationsAdiseasereachesepidemiclevelswhenacertainnumberofdeathsoccurasaresultofitandthisnumberwillbedifferentforeachdisease.Onediseasemightresultinjustafewdeathsbutbeclassifiedasanepidemic,as3.______________otherssuchastheflu,whichis4______________

hasmuchhigherbaselines.opposedtowidespreadInhumanhistory,therehavebeensomedeadlyepidemics.Intheearly20thcentury,theSpanishFluof1918wasamassiveepidemicthatkilledan5.___________of50millionpeople,morethanthenumberofpeoplewhodiedinWorldWarI.estimateInitially,itwasbelievedthatepidemics6.____________littlethreattothemodernworld,untilSARSoutbreakin2002.TheSARSepidemicstartedasa7___________diseaseinChinabuteventuallyspreadacrossthe8.________________

tocountriessuchasCanadaandVietnam.poselung

globe

Itresultedinthe

infectionofabout8,000peopleandsincethen,scientistshaveundertaken9____________ontreatmentstopreventfuturedeaths.

trial

課本70頁5ChenXiandJonathan,anEnglishexchangestudent,aretalkingabouttheirhomeworktogatherfactsabouttheEbolavirusoutbreakinAfricain2014.Completetheirdialoguewiththecorrectformoftheverbsinbrackets.ChenXi:Isn'titreallybadifyougetEbola?

Jonathan:Yes,Ebola1_____________(be)aseriouslife-threateningdisease.I2.____________(find)outthatthefirstpersontodieinthisoutbreakwasa2-year-oldchildwho3______________(live)inaruralvillageinGuinea,Africa.

is

found

lived

ChenXi:Howterrible!Jonathan:Yes,butbyNovember2014there4_______________(have)almost5,000deaths.Someexpertsbelievethisfigure5.________________(be)higherbecause

somepeople6_______________

(donot)seekmedicalhelp.

hadbeenis

didnot

ChenXi:I7_____________(discover)thatthevirus8______________________(spread)fromonepersontoanother.Inthisoutbreak,symptoms9________________(appear)betweeneighttotendaysafterdirectcontactwithaninfectedperson.discovered

spread

appeared

Jonathan:Howcantheystopanotherlargeoutbreak?

ChenXi:They10.____________________________notdevelop)avaccineyet,buttheyhavelearnttoisolatepatientswhentheyhavesymptoms.

Jonathan:Ihopescientistscandevelopavaccinesoon.

havenotdeveloped

課本79頁3Lesson3Choosethewordsbelowtoreplacethewordsorphrasesinitalics.

multiplepacesalaryretirementdecent

occupationsessentialspecialistretrain

likelihoodIlistenedtoareallyinterestingpodcast(博客）aboutfuturecareersyesterday.Itsaidthatwecanexpecttohave1manyjobsoverthecourseofourlivesratherthanjustone.1.multipleoccupations

Thingsarechangingataveryfast2speedthesedaysinthejobmarketandthiswillcontinueinthefuture.2.pace

Althoughtherewillalwaysbetheopportunitytoearna3satisfactoryincome,ifyouwanttoreallyachievegreatthings,youshouldaimtobecomea4highlyskilledpersoninoneparticulararea.3.decentsalary

4.specialistThereisastrong5chancethatpeoplewillregularly6trainagaintoleammoreskillsuntiltheyreach7thetimetheystopworking.5.likelihood

6.retrai