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30.What ismany organizations'attitude towrdsnhdges?A.Puzzled.B.Concerned.31.What is the best title for the text?C.Humble.D.Indifferent.A.Hedges:Ancient ResourcesB.Hedges:Official RecommendationsC.Restoring Hedges:Bringing Benefits to the EnvironmentD.Researching Hedges:Originating from Farmers'RequestDMeteorites ()can offer clues about what theyysteas like.But findingthem is far from difficult.Now,some scientists are turning to droes (and machinelearning to help spot freshly fallen metrites much more efficiently."Ateam of six peopeona meteorite-hunting expedition can search about 200,000square meters per day,says SeamusAnderson,a planetary scientist in Australia.Around 2016,Anderson began toying with the concept of using drones totake pictures ofthe ground to look for meteorites.That idea blossomed intoa Ph.D.project.In 2022,he andhis colleagues reported their first successful recovery of a meteorite spotted with a drone.They've since found four more meteorites at a different site.Drone-based searches are muchfaster than the standard search way."You're going from about 300 days of human effort downto about a dozen or so,"he says.Anderson and his workmates have used drones to search for meteorites in remote parts ofWestern Australia and South Australia.The team is tipped off about a fall site by networks ofground-based cameras that track meteoroids flashing through the Earth's atmosphere.Theresearchers have to do a series of fun but difficult work before the hunt.They pack a fourwheel drive vehicle with drone and computer equipment,battery charging stations,generators,fuel,food,camping equipment,tables,chairs and much more.The drive to thefall site can take more than a day,often on rough or nonexistent roads.Anderson says,"Youhope you don't pop a tire.After arriving,the team flies its primary drone at an altitude of about 20 meters.Itscamera takes an image of the ground once every second,and the scientists download the dataevery 40 minutes or so when the drone lands to receive fresh batteries.A typical day of flyingcan net over 10,000 images,which are then divided digitally into 100 million or so smallersections.Those "tiles",each 2 meters on a side,are fed into a machine learning algorithmthat has been trained to recognize meteorites based on images of real land rocks which arespray-painted black.32.Why do the scientists study meteorites?A.To spot the planetary course.B.To promote machine learning.C.To test the functions of drones.【高三英语第6页（共10页）】·24-262C·7