City traffic jam—one of the least wanted effects of the motor vehicle—is something with which we’re all familiar and for which m

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问题     City traffic jam—one of the least wanted effects of the motor vehicle—is something with which we’re all familiar and for which most of us have an answer. But which solution is best?
    Some people suggest for better roads, others for cars to be banned (禁止) from city centers and yet others say better public transport would attract drivers from their lonely and boring journeys.
    But the important question is what natural power creates a big city center. We are, after all, in an age of electronic communication; our big shopping areas have moved out of city centers, and our living areas moved out of them long ago.
    Yet some force causes offices and service industries related to them to gather in London or New York or Tokyo. This suggests that far from the problems of a crowded environment forcing companies and people to move out, there is a critical (重大的) size beyond which more companies are attracted to move in. Nobody seems to know why, yet the answer is important to the way traffic jam is dealt with.
The word "This" (Line 2, Para.4) refers to______.

选项 A、some force
B、traffic jam
C、the force that causes offices to move in or out
D、the fact that companies gather in big cities

答案D

解析
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