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A.Charcoal problem is the focus of attention.B.Charcoal is what we need right now.C.Our survival lies in the use of charcoal.D.It is charcoal that helps us people keep fit.29.What is not the consequence of cooking with biomass according to the text?A.Indoor air pollution.B.Gender-based violence.C.Kids'absence from school.D.Forest degradation.30.What is the barrier to clean cooking?A.Lack of donor campaigns.B.High fuel costs.C.Inefficient government.D.Funding shortfalls.31.What can we learn about the policies in the last paragraph?A.They should be aimed at poor countries.B.They will lead to a reduction in fuel use.C.They should be carefully considered.D.They call for continuous observation.D"This is the next revolution in flying,"says Mark Henning,European managing director ofAutoFlight,a Chinese firm.Mr.Henning is not alone in betting that electric vertical take-off and landing(eVTOL)aircraft have a bright future.The idea is that,being simpler,cheaper,greener and quieterthan traditional helicopters,eVTOLs will be well suited to operate short-range passenger services acrosslarge urban areas,such as flying people between airports and city centres.Now,Mr.Henning is setting up an operation at Augsburg Airport in Germany to further thedevelopment of Prosperity I,the company's air taxi.Prosperity I can seat three passengers and a pilot.Itis a hybrid between a helicopter and a fixed-wing plane.It takes off and lands vertically,using multiplerotors(旋翼)，but these are switched off when it is in full flight.At that point a“pusher'”propeller(螺)at the back takes over,to provide forward drive,and thus lit via the wings.This arrangementmakes better use of the aircraft's battery,giving Prosperity I a range of some 250 km.A model will be test-flown in Germany in order to obtain what is known as a type certificate from theEuropean Union Aviation Safety Agency(EASA).This signifies the airworthiness of a new aircraft.Although AutoFlight is also seeking certification in China,the company thinks the addition of Europeanapproval will help speed the machine's entry into service in other markets,too.It hopes to complete theapproval process by 2025.There is uncertainty about how the rules will differ from place to place.Nonetheless,enough regulatoryprogress has been made.In America,Joby Aviation hopes next year to become the first to obtain a typecertificate from the Federal Aviation Administration(FAA).In Europe,Volocopter,a German firm,hopes toprovide air-taxi services for the 2024 Olympic Games in Paris.It is not only new firms which are getting into the business.Airbus is developing ideas for eVTOLs.So is Boeing.With so much effort and money going into this new form of air travel,some of these birdswill surely be flying soon.榆林市高二年级英语试题-6-（共10页）