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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, 46 North America, our picture suggests that the share of traffic 47 supplied by buses and automobiles will decline as high-speed transport rises sharply. In developing countries, we anticipate the strongest increase to be in the shares first for buses and later for automobiles. Globally, these 48 in bus and automobile transport are partially offsetting. In all regions, the share of low-speed mil transport will probably continue its strongly evident decline.
    We expect that throughout the period 1990~2050, the 49 North American will continue to devote most of his or her 1. 1-hour travel-time budget to automobile travel. The very large demand 50 air travel (or high-speed rail travel) that will be manifest in 2050 works out to only 12 minutes per person a day; a little time goes a long way in the air. In several developing regions, most travel 51 in 2050 will still be devoted to nonmotorized modes. Buses will persist as the primary form of motorized transportation in developing countries for decades. 52 important air travel becomes, buses, automobiles and 53 low-speed trains will surely go on serving vital functions. 54 of the super-rich already commute and shop in aircraft, but average people will continue to spend most of their travel time on the 55 .
选项 A、Despite the fact
B、Whatever it is
C、No matter how
D、whether or not
答案C
解析 在结构上只有no matter how与important表示主从句之间的让步关系，而其他三项均表达让步的关系，不合题意。
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