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  3. Assuming that a constant travel-time budget, geographic constraints and short-term infrastructure constraints persist as fundame

Assuming that a constant travel-time budget, geographic constraints and short-term infrastructure constraints persist as fundame

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问题     Assuming that a constant travel-time budget, geographic constraints and short-term infrastructure constraints persist as fundamental features of global mobility, what long-term results can one expect? In high-income regions,【C1】______North America, our picture suggests that the share of traffic volume supplied by buses and automobiles will decline as high-speed transport rises sharply.In developing countries, we【C2】______the strongest increase to be in the shares first for buses and later for automobiles.Globally, these trends in bus and automobile transport are partially offsetting.In all regions, the share of low-speed mil transport will probably continue its strongly【C3】______decline.
    We expect that throughout the period 1990—2050, the average North American will continue to devote most of his or her 1.1-hour travel-time【C4】______to automobile travel. The very large demand【C5】______air travel (or high-speed mil travel) that will be manifest in 205051 to only 12 minutes per person a day; a little time goes a long way in the air.In several developing regions, most travel【C7】______in 2050 will still be devoted to nonmotorized modes.Buses will persist as the primary form of motorized transportation in developing countries for decades.【C8】______important air travel  becomes, buses, automobiles and54 low-speed trains will surely go on serving vital functions.Some of the super-rich already commute and shop in aircraft, but average people will continue to spend most of their travel time on the【C10】______.
【C10】
选项 A、mountain
B、ground
C、sky
D、land
答案B
解析 从前一分句的“in aircra”可以推断出此处是“地面交通”的意思，因此B项的ground符合文意。land指陆地，针对海洋而言。
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