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A sustainable transportation system is one that is safe, capable and friendly to the environment. Sustainable transportation is

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问题     A sustainable transportation system is one that is safe, capable and friendly to the environment. Sustainable transportation is about combining economic, social and environmental factors into decisions that affect transportation activity. In economic aspect, we need a transportation system that is efficient. In social aspect, our transportation system must be safe and easy to be reached. In addition, we need a transportation system that respects the natural environment. It is not always easy to balance these three factors but there are also win-win-win opportunities.
    Sustainable transportation is important. Although transportation brings many economic and social benefits, the movement of people and goods can have important influences on the environment. These influences can in turn have social and economic consequences. Sustainable transportation calls for ensuring that the environment is considered along with economic and social considerations in transportation decision-making.
    (73)Environmental influences of transportation include air and water pollution, greenhouse effects, and the use of land and other natural resources. A range of transportation activities contribute to these pressures, including the construction of roads: the production, operation, and throwing away of vehicles: and the supply of energy and fuel.
    A major challenge of sustainable transportation is to control or prevent air pollution and greenhouse effects.
How should we understand the social benefits of a sustainable transportation system?
选项 A、It should be efficient.
B、It should be safe.
C、It should be friendly.
D、It should be constructive.
答案B
解析 事实细节题。根据文章第一段第四句“In social aspect，…be safe and easy to be reached．”可知，B项为正确答案。
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