Transportation Transportation is an essential part of urban design. There are a number of【C1】______(benefit)forms of green t

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问题                         Transportation
    Transportation is an essential part of urban design. There are a number of【C1】______(benefit)forms of green transportation that support and enhance walkable urbanism. These green transportation options make our lives more【C2】______(easy), reduce congestion, reduce our【C3】______(depend)on cars and oil, are safer and less costly, help save trie planet...and make life more fun!
    The【C4】______(green)and most sustainable forms of transportation are trains, bicycles, and【C5】______(walk). Some of the world’s best and fastest trains have been in【C6】______(operate)for more than 25 years in Europe, and more than 25 years in Japan. These include futuristic highspeed【C7】______(train)like the Eurostar, the French TGV, the Japanese bullet train;and also【C8】______(region)trains, monorails, light rail, trams, trolleys, streetcars, and so on. Clean【C9】______(electricity)trains are a major form of daily transportation in numerous countries, and are the single most powerful transportation choice that can solve serious energy, environmental, economic, health, and social problems on a【C10】______(globe)scale.
【C4】

选项

答案greenest

解析 这里是两个形容词最高级the+所填词和most sustainable修饰名词forms,因此应填入形容词的最高级。
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