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1、题组层级快练34Unit4Sharing阅读速度提升练（时间：20分钟）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）屮选出最佳选项。（改编）ThebrownwidowspiderbecameestablishedinSouthernCaliforniainearly2000andhasbecomepartofthelocalspiderfamilyinurbanLosAngelesandSanDiego.ThebrownwidowspideriscontinuingitsexpansioninSouthernCaliforniaa
2、ndcouldpossiblymovenorthwardintoCentralCalifornia・ThebrownwidowissuspectedtohaveevolvedinAfricaalthoughitwasfirstdescribedfromSouthAmerica,whichaddsconfusionastowhereitmighthaveoriginated.TtisatropicalandsubtropicalspiderhavingestablishedpopulationsinHawaii,Florida,partsofAustr
3、alia,SouthAfricaandJapan.TnNorthAmerica,thebrownwidowwasrestrictedformanydecadestotheFloridapeninsula.However,aroundtheyear2000,itstartedshowingupinotherGulfCoaststates・BrownwidowsarenowknownfromTexastoGeorgiaandSouthCarolina.Thebrownwidowbuildsitswebinprotectedsitesaroundhomes
4、andinwoodyvegetationwithbranches-Sometypicalsitesselectedbybrownwidowsforwebbuildingareemptycontainerssuchasbucketsandnurserypots,mai1boxes,entrywaycorners,undereaves,storageclosetsandgarages,undercarriagesofmotorvehiclesthatarestationaryforlongperiods,andtheundersidesofoutdoor
5、furniture・Theychooseplacesthataremoreexposedthansiteschosenbyblackwidowsandtherefore,appeartobeathigherriskforinteractionswithhumansasfarasbitesareconcerned.Onerecentstudydemonstratesthatthebrownwidowspiderislesspoisonousthanotherwidowspecies.Thereasonfortheweakereffectofbrownw
6、idowbitesonhumansispossiblybecausethebrownwidowdoesnothavemuchpoisonasitslargerrelatives,butitisreallyathreattohumansastoitspoison.Thetwomajorsymptomsofabrownwidowbitewerethatthebitehurtwhenitwasgivenanditleftaredmark・Thesetwosymptomsarenotmuchdifferentfromthebiteofnormalhouseh
7、oldspiders.Thereisnospecificinformationregardingthecontrolofbrownwidowsbyfarmchemicals.MostcurrentadviceiswhatisusedforcontrollingspidersingeneraLTherefore,mostcommerciallyavailablefarmchemicalsshouldworkonbrownwidows・Avoidingamessofthehouseandthegarageshouldreducenestsitesfort
8、hem.Also,oneshouldstoregarageitemsinplasticbagswhereth
