Anewstudyfindsthatplantscommunicatewithoneanothertowarnofdanger.Weoftenconsiderplantsasthefurnitureofthenaturalworld.Theydon’tmove;theydon’tmakesounds,theydon’tseemtoactonanything.Butasisoftenthec

　　Anewstudyfindsthatplantscommunicatewithoneanothertowarnofdanger.

　　Weoftenconsiderplantsasthefurnitureofthenaturalworld.Theydon’tmove;theydon’tmakesounds,theydon’tseemtoactonanything.Butasisoftenthecase,plantstalktoeachotherallthetime.Andthelanguageischemical.

　　Overtheyears,scientistshavereportedthatdifferenttypesofplants,fromtreestotomatoes,giveoutchemicalsintotheairtohelpneighboringplants.Thesechemicalwarningscanspreadinformationaboutoneplant’sdiseaseorinfestation(虫害),sootherplantscanprotectthemselves.Buthowplantsreceiveandactonmanyoftheinformationexactlyisstillmysterious.

　　Inthisweek’sScienceMagazine,researchersinJapanofferedsomeexplanations.Theyhavefoundoutonechemicalmessageandtraceditallthewayfrombeginningtoend.

　　Thescientistslookedattomatoplantsinfestedbyacommonpest(害虫).Tostartout,theygrewplantsintwoseparateplasticspacesconnectedbyatube(管子).Oneplantwasinfestedandplacedupwindandtheotherwasuninfestedandplaceddownwind.Thedownwindplantswerelaterexposed(暴露)tothepest.Theresultsshowedthatplantsnearsickneighborsbeforewereabletoprotectthemselvesbetteragainstthepest.

　　Theyfoundonechemicalappearedmoreoftenintheexposedplants.ThechemicaliscalledHexVic.ThescientistsdiscoveredwhereHexViccomefrom,andputitoverhealthyplants.ThoseplantswerethenabletoproduceHexVic.Researchersmadesurethatuninfestedplantscouldfightoffbugsanddiseases.Howdotheyknowwhentoprotectthemselves?Theyarewarnedfirstbytheirfriendlyplantneighbors.

　　Itisnotasimplestory,anditmaybehappeninginmoreplantspeciesthantomatoes.Itmayalsobehappeningwithmorechemicalsignalsthatarestillunknowntous.Inaword,weknowthatplantsnotonlycommunicate,butalsolookoutforoneanother.

　　小题1:Theunderlined“traced”inthefourthparagraphprobablymeans_________here.A．reportedB．followedC．doubtedD．developed小题2:Forscientists,whicharetherightstepstowatchtomatoplantsinfestedbyapest?

　　① Placetheinfestedplantupwind.

　　② Placet