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RobotsonthefarmWhatcandronesdo?Theirmanyusesincludetakingpicturesfromthesky,observing(观察)wildanimalsanddeliveringpackages.Nowthesesmallflyingrobotsareleadinganewfarmingrevolution(革命),accordingtotheFoodandAgricultureOrganizationoftheUnitedNations.Whenequipped(装备)withcamerasandotherdata-gatheringdevices,dronesprovideuswithaneyeinthesky.Hereareafewofthefarming-relatedjobsdronescando.LookingforsickcropsDronescanscan(扫描)cropsusingdifferentkindsoflight.Then,theyproducemultispectralimages(多谱图像)thatcanhelpusfindsicklyyellowplantswithinfieldsofgreen.Dronescanalsodetectbacteria(检测细菌)thatareharmfultocropsintheairfromafewkilometersaway.Farmerscancheckthedrones’airsamples(样本)andtrytofindwaystoprotecttheircropsbeforethebacteriagettothem.CountingcattleWhenflyingovercattle,dronescantrackthelivestockandfindoutwherefencesneedfixing.Peoplecanalsoequipdroneswiththermalimagers(热像仪)andnight-visioncameras.Thiscanhelpfarmerslookforanimalsthatcouldharmtheircattle.WaterwatchMostfieldsaren’tperfectlyflat(平坦的).Afterwatering,someplacesmaydryoutfasterthanothers.Otherspotsmightnotgetwateratall.Dronescanscanthefieldandmakea3-Dmap.Usingthemap,farmerscanfigureoutwhichpartsofafieldaredryorneedimprovement.Sprayingpesticide(喷洒农药)Differentpartsofafieldmightbeunevenorhavedifferentaltitudes(高度).Dronescancheckforthiswhenflyingabovetheland.Then,theychangetheirheightandthereforespraythecorrectamountofpesticideovereachpartofthefield.Thisismoreefficientthantraditionalpesticidespraying.Dronescanfinishsprayingafielduptofivetimesfasterthanwithtraditionalmachinery,accordingtoastudyfromMIT.Choosetheanswer:1.Whatcandronesdotohelpfarmerswiththeirfarming?A.Takepictures.B.Lookatwildanimals.C.Deliverpackages.D.Lookforsickcrops.2.Whatdodronesneedtohelpguardcattleatnight?A.Woodenfences.B.Airsamples.C.Night-visioncameras.D.3-Dprinters.3.Whatdoestheunderlinedword“uneven”probablymean?A.不肥沃的B.不相连的C.不平衡的D.不平坦的4.Whatdoweknowfromthestory?A.Dronescan’tdetectbacteriaunlesscropsaresick.B.Dronescanfightdangerousanimals.C.Dronescanhelpfarmersmakesurefieldsareproperlywatered.D.Dronesarebetteratsprayingpesticideoverflatland.答案：DCDC