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1、2019-2020年高三英语一轮复习题组层级快练34Unit4Sharing新人教版选修(I)Ⅰ.阅读理解阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。(改编)ThebrownwidowspiderbecameestablishedinSouthernCaliforniainearlyxxandhasbeepartofthelocalspiderfamilyinurbanLosAngelesandSanDiego.Thebrownwidowspideriscontinuingitsexpansi
2、oninSouthernCaliforniaandcouldpossiblymovenorthwardintoCentralCalifornia.ThebrownwidowissuspectedtohaveevolvedinAfricaalthoughitwasfirstdescribedfromSouthAmerica,whichaddsconfusionastowhereitmighthaveoriginated.Itisatropicalandsubtropicalspiderhavingestablished
3、populationsinHawaii,Florida,partsofAustralia,SouthAfricaandJapan.InNorthAmerica,thebrownwidowwasrestrictedformanydecadestotheFloridapeninsula.However,aroundtheyearxx,itstartedshowingupinotherGulfCoaststates.BrownwidowsarenowknownfromTexastoGeorgiaandSouthCaroli
4、na.Thebrownwidowbuildsitswebinprotectedsitesaroundhomesandinwoodyvegetationwithbranches.Sometypicalsitesselectedbybrownwidowsforwebbuildingareemptycontainerssuchasbucketsandnurserypots,mailboxes,entrywaycorners,undereaves,storageclosetsandgarages,undercarriages
5、ofmotorvehiclesthatarestationaryforlongperiods,andtheundersidesofoutdoorfurniture.Theychooseplacesthataremoreexposedthansiteschosenbyblackwidowsandtherefore,appeartobeathigherriskforinteractionswithhumansasfarasbitesareconcerned.Onerecentstudydemonstratesthatth
6、ebrownwidowspiderislesspoisonousthanotherwidowspecies.Thereasonfortheweakereffectofbrownwidowbitesonhumansispossiblybecausethebrownwidowdoesnothavemuchpoisonasitslargerrelatives,butitisreallyathreattohumansastoitspoison.Thetwomajorsymptomsofabrownwidowbiteweret
7、hatthebitehurtwhenitwasgivenanditleftaredmark.Thesetwosymptomsarenotmuchdifferentfromthebiteofnormalhouseholdspiders.Thereisnospecificinformationregardingthecontrolofbrownwidowsbyfarmchemicals.Mostcurrentadviceiswhatisusedforcontrollingspidersingeneral.Therefor
8、e,mostmerciallyavailablefarmchemicalsshouldworkonbrownwidows.Avoidingamessofthehouseandthegarageshouldreducenestsitesforthem.Also,oneshouldstoregarageitemsinplasticbagswhere
