A、56 percent. B、96 percent. C、24 percent. D、28 percent. B[听力原文] What percentage of American cars are produced in Detroit? 通过四个选项

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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、56 percent.
B、96 percent.
C、24 percent.
D、28 percent.

答案B

解析 [听力原文]
What percentage of American cars are produced in Detroit?
通过四个选项可知问题是关于百分比,因此要特别注意捕捉有关百分比的数字。由短文中"Four Detroit automobile companies produce 96 percent of all American cars."可知底特律的四大汽车公司生产全美96%的汽车。故选项B)为正确答案。
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