A、These factories produced machines in the past. B、These factories produced farm tools in the past. C、These factories manufac

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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、These factories produced machines in the past.  

B、These factories produced farm tools in the past.
C、These factories manufactured bicycles in the past.
D、These factories manufactured cars tools in the past.

答案C

解析 [听力原文]
What did the factories manufacture before being converted into automobile plants?
由于四个选项的结构均为"These factories...in the past."可知问题询问这些公司过去生产什么产品。由“Factories for manufacture of bicycles and wagon bodies...these factories were converted into automobile plants.”可知这些工厂原来生产自行车和运货马车,故正确答案为C)。
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