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1、Unit1ThisstoryissetinthecentralandwesternU.S.,particularlyinthestatesofTexas,Oklahoma,Kansas,Nebraska,NorthandSouthDakota,andWyomingaswellastheRockyMountains.Inthe1800s,theRockyMountainlocustbroughtmassivedestructiontoWesternsettlers.Then,theinsectssud
2、denlydisappearedalmostwithoutatrace.Nowscientistshopetofindareasonforthelocust'sextinction.WhatcausedtheRockyMountainlocusttodisappear?Wherewillthescientistsfindtheanswers?I.Locusts!Readtheparagraph.Thenmatcheachwordwiththecorrectdefinition.Manyplacesi
3、ntheworldregularlyexperienceplaguesoflocuststhatcandevastateentirecountries.Locustsmoveinhugeswarms,invadeentireregions,andusuallyconsumeeverythingintheirpath.Oneswarmoflocustscontainingtrillionsofindividualinsectscaneatthousandsoftonsofvegetationaday.
4、Locustsareoneoftheworld'smostdestructiveinsects,buttheythemselvesaresometimesdestroyed.Inthe1800s,forexample,theRockyMountainlocustmysteriouslybecameextinct.1.plague___E___2.locust___G___3.devastate___C___4.swarm___E___5.trillion__A____6.vegetation__F_
5、___7.extinct___B___A.1,000,000,000,000B.nolongerinexistenceC.causeextremedamageD.anywidespreadcauseofmisery,suffering,ordeathE.alargegroup,usuallyofinsectsF.theplantcoveringanareaG.aninsectnotedforflyinginlargegroupsanddestroyingcropsII.TheRockyMountai
6、nLocustMystery.Readtheparagraph.Thencompletethedefinitionswiththebasicformoftheunderlinedwordsorphrases.Dr.JeffLockwoodisanentomologistwhoisparticularlyinterestedinthedisappearanceoftheRockyMountainlocust.Thespecieswasmysteriouslywipedoutinthelate1800s
7、andtherearen'tmanycluesastowhyithappened.BystudyinglocustspecimensunderamicroscopeandbytakingDNAsamplesfromthedeadlocusts,LockwoodaimstofindoutwhytheRockyMountainlocustsuddenlydisappearedfromEarth.1.athingorfactthathelpsprovideananswertoaquestion;evide
8、nce:clue2.apersonwhostudiesinsects:entomologist3.anitemthatisanexampleofalargergroup:specimen4.destroycompletely;causetonolongerexist:wipeout5.ascientificinstrumentthatuseslensestomakesmallobjectsappearlarger:microscope6.thematerialthat
