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1、阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选岀最佳选项。Plantscan’tcommunicatebymovingormakingsounds,asmostanimalsdo.Instead,plantsproducevolatilecompounds,chemicalsthateasilychangefromaliquidtoagas.Aflower'ssweetsmell,forexample,comesfromvolatilecompoundsthattheplantproducestoattractinsectssuchasbugsandbees，Pl
2、antscanalsodetectvolatilecompoundsproducedbyotherplants.Atreeunderattackbyhungryinsects,forinstance,maygiveoffvolatilecompoundsthatletothertreesknowabouttheattack.Inresponse,theothertreesmaysendoffchemicalstokeepthebugsaway—orevenchemicalsthatattractthebugs'naturalenemies.Nowscientistshavecre
3、atedaquickwaytounderstandwhatplantsaresaying:achemicalsensor（传感器）calledanelectronicnose.The〃e-nose〃cantellcompoundsthatcropplantsmakewhenthey’reattacked.Scientistssaythee-nosecouldhelpquicklydetectwhetherplantsarebeingeatenbyinsects.Buttodaytheonlywaytodetectsuchinsectsistovisuallyinspectindi
4、vidualplants.Thisisachallengingtaskformanagersofgreenhouses,enclosedgardensthatcanhousethousandsofplants.Theresearchteamworkedwithane-nosethatrecognizesvolatilecompounds.Insidethedevice,13sensorschemicallyreactwithvolatilecompounds.Basedontheseinteractions,thee-nosegivesoffelectronicsignaIsth
5、atthescientistsanalyzeusingcomputersoftware.Totestthenose,theteampresenteditwithhealthyleavesfromcucumber,pepperandtomatoplants,allcommongreenhousecrops.Thenthescientistscollectedsamplesofairarounddamagedleavesfromeachtypeofcrop.Theseplantshadbeendamagedbyinsects,orbyscientistswhomadeholesint
6、heleaveswithaholepunch（打孑L器）•Thee-nose,itturnsout,couldidentifyhealthycucumber,peperandtomatoplantsbasedonthevolatilecompoundstheyproduce.Itcouldalsoidentifytomatoleavesthathadbeendamaged.Butevenmoreimpressive,thedevicecouldtellwhichtypeofdamage—byinsectsorwithaholepunch—hadbeendonetothetomat
7、oleaves.Withsomefine-tuning,adevicelikethee-nosecouldonedaybeusedingreenhousestoquicklyspotharmfulbugs,theresearcherssay.Adevicelikethiscouldalsobeusedtoidentifyfruitsthatareperfectlyripeandreadytopickandeat,saysNataliaDudareva,abiochemistatP
