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Under real conditions,a bike path network is created by constantly adding bike paths to morestreets.This time,researchers start with an ideal,complex network,in which all streets in a city areequipped with a bike path.In a virtual process,they gradually remove less used bike path sectionsfrom this network.The route selection of cyclists is continuously updated.Thus,a series of bike pathnetworks is created and is always adapted to the current usage.Each stage of it corresponds to avariant that could be carried out with less financial support."We illustrate the applicability of this demand-driven planning for crowded urban areas ofDresden and Hamburg,"explains researcher Christoph Steinacker."We are approaching a real-lifeissue here using the theoretic toolbox of network dynamics and compare efficient bike path networksunder different conditions."28.Why do people rarely cycle?A.They think of cycling as inefficient.B.They usually take long-distance tripsC.They're concerned about the security.D.They're unable to find special bike roads.29.What is a challenge for good bike path networks?A.Tight budgets.B.Complex routes.C.Maximized travel distance.D.Decreasing cycling demand.30.What can be learned about the planning put forward by researchers?A.It will be updated once in a while.B.It is contrary to the real-life design.C.It ensures every street has a bike path.D.It serves as a model for other districts.31.Which of the following is the best title for the text?A.Good Planning Gets the Bike RollingB.A good Network Benefits More PeopleC.Cycling Paths Change Crowded Urban AreasD.A New Concept Contributes to a Better WorldDResearchers at the University of Massachusetts Amherst UMass Amherst)recentlyannounced that they have figured out how to engineer a biofilm (that harvests the energyin evaporation (and changes it to electricity.This biofilm,which was announced in NatureCommunications,has the potential to revolutionize the world of wearable electronics,poweringeverything from personal medical sensors to personal electronics.