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24.Why does the author wear a bike helmet while working in the garden?A.To protect the injured skull.B.To prevent herself from sunburn.C.To avoid being hit by the nuts.D.To reduce the chance of getting bitten by bees.25.What is the tree's survival strategy?A.It attracts beneficial pollinators.B.C.It lets out poison to drive away pests.D.It produces a deadly chemical to some plants.it competes for nutrition with similar species.26.Which of the following account for the author's love-hate relationshipwith the tree?1.The presence of the tree takes up much space of the garden.2.The tree outcompetes the native plants in the garden.3.The tree is home to numerous birds and other creatures.4.The volume of its fruits may bring inconvenience.A.①②③B.①③④C.②③④27.The author most probably got a reminder from the tree thatD.①②④A.it's better to give than to takeB.trees and plants have their own ways to thriveC.a good relationship is always trouble-freeD.acceptance,instead of resistance,is the better way to beCAcronautics (specialists from the University of South Australiaspentmonths studying the dragonfly's flight,creating 3D models from digital images,to builda winged drone().Study leader Javaan Chahl believes that winged drones basedon the dragonfly's shape and movement will simply be more flexible and energyefficient.Chahl's team used a special photography technique to classify the wing shapes of75 different dragonfly species from museum collections.Their wings are long,light andhard.Plus,their long bodies give them excellent stability and balance,making itpossible for winged drones to deliver awkward loads and undertake long observationmissions.Investigating the way that dragonflies remain stable during flight actually revealsthe skills they use to get themselves out of tricky situations.Dragonflies are found tobe able to perform upside-down backflips()to regain balance and normal flight,when they find themselves upside down mid-air.This special skill can even beperformed while dragonflies are unconscious,meaning it is a passive stabilitymechanism similar in concept to planes that are designed to glide()to safety withtheir engines turned off.Engineers are looking to copy dragonfly wings to create saferdrones that can right themselves.Of course,not all attempts to build dragonfly-like drones are successful.TechJet'sair vehicle was supposed to operate as an aerial camera,observation and security drone,第5页共10页