2. 外语
  3. Big cities today are confronted with very serious problems. Transport is a【C1】______difficulty: some planners believe in【C2】____

Big cities today are confronted with very serious problems. Transport is a【C1】______difficulty: some planners believe in【C2】____

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问题     Big cities today are confronted with very serious problems. Transport is a【C1】______difficulty: some planners believe in【C2】______transport system; others believe in making it possible for citizens to move【C3】______in private cars. There are several ways of 【C4】______a public transport system. Sometimes it is built under the ground, sometimes it is on the 【C5】______, and sometimes it is even above ground level, 【C6】______in parts of New York and Tokyo, for example. In most cases, of course, it is a(n) 【C7】______of some or all of these elements.
    The【C8】______of the city centers has also been a problem in the last 30 years. The hearts of many cities have become poorer and poorer, 【C9】______more and more crime and violence, 【C10】______the people who can afford to have moved out to the【C11】______This is the opposite of the situation 100 years ago, 【C12】______wealthy people lived in the center, and the poor lived【C13】______the outskirts of the city.
    Ecological problems also【C14】______, as factories and cars pollute the air, trees are cut down to make【C15】______for urban clear ways, and crowded conditions cause garbage to【C16】______in the streets.
    In order to solve these problems, some planners believe we should limit the size of our cities, perhaps by restricting population, or perhaps by offering【C17】______jobs in provinces. Others believe that cities cannot be limited in size and that the problems must be solved in a【C18】______of ways by creating green areas, building【C19】______houses for everybody, stopping factory pollution, 【C20】______motor transport, and so on.
【C13】
选项 A、on
B、in
C、at
D、by
答案A
解析 固定搭配。“在”郊区的介词用on，on the outskirts是固定用法。故答案为A。
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