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托福TPO9综合写作题目及范文托福TPO9综合写作题目及范文 汽车制造商和___都在积极地寻找内燃机的代替品,TPO9综合写作题目材料就氢燃料电池发动机替代内燃机的可行性进行了讨论下面是的托福TPO9综合写作范文,希望能帮到大家! The lecturerpoints outseveral problemswith theuse ofhydrogen-based fuel-cell enginesin supportof herclaim thatsubstituting themfor internal-bustion enginesis technologicallyunfeasible,environmentally unfriendly,and economicallyunviable. First,the lecturerstates thatit isimpractical toreplace internal-bustion engineswith fuel-cell enginesbecause usingthe latterrequires hydrogenin apure liquidform,which istechnologically challengingto bothobtain andstore.However,the readingargues thatbecause hydrogencan beextracted from___ny resourcesincluding water,fuel cellengines poweredby thisinfinite sourceof energyare anextremely attractivealternative. Second,the lecturerrefutes theclaim inthe readingthat hydrogencells areenvironmentally friendly.She arguesthat althoughengines thatuse hydrogencells produceless p...。