A、The growth of Detroit as an industrial city. B、Detroit, the fifth largest city in the U. S. A. C、The geographical advantages o

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问题  
The territorial growth in the United States was followed by great industrial expansion. The country was rich in natural resources. A constant flow of immigration provided the labor force necessary to develop these resources. New industries were started. Chicago, St. Louis, and Detroit grew from small towns to large cities. The United States became the greatest industrial country in the world.
    Detroit’s growth has been typical of these new American cities. Situated on the Detroit River close to the Great Lakes, it had the geographical advantages necessary for industrial growth.  Factories for manufacture of bicycles and wagon bodies were established there. With the coming of the automobile, these factories were converted into automobile plants. The American system of mass production was introduced. The industry grew and Detroit grew with it.
    Detroit today is the fifth largest city in the United States.  Four Detroit automobile companies produce 96 percent of all American cars. Twenty thousand of these cars roll off Detroit assembly lines each day. Some of the factories there never stop. They have three groups or "shifts" of workers. Each shift works eight hours and is relieved by a new shift, making all together a twenty-four-hour day. So Detroit has been called "The City of Three Shifts". As a result,  in the Ford plant it is possible to build an entire car in less than twenty- eight hours. In little more than a day, pure iron can be converted into a shiny new car of the latest model.

选项 A、The growth of Detroit as an industrial city.
B、Detroit, the fifth largest city in the U. S. A.
C、The geographical advantages of Detroit.
D、The car industry in the U. S. A.

答案A

解析 What is the main topic of the talk?
通过四个选项的语句结构可推断问题可能关于对文章大意的概括。由文章第二段第一句描述的底特律的经济增长在美国城市中非常典型,以及第三段第一句底特律今天已经成为美国第五大城市等句子可以推断本文大意是关于工业城市底特律的经济增长。故正确答案为A)。
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