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  3. Before the 20th century the horse provided day to day transportation in the United States. Trains were used only for long-distan

Before the 20th century the horse provided day to day transportation in the United States. Trains were used only for long-distan

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问题 Before the 20th century the horse provided day to day transportation in the United States. Trains were used only for long-distance transportation.
    Today the car is the most popular【C1】______ of transportation in all of the United States. It has completely【C2】______ the horse as a means of everyday transportation. Americans use their car for【C3】______ 90 percent of all personal【C4】______ .
    Most Americans are able to【C5】______ cars. The average price of a【C6】______ made car was, 500 in 1950, 740 in 1960 and up【C7】______ 750 in 1975. During this period American car manufacturers set about【C8】______ their products and work efficiency.
    Meanwhile, the yearly income of the【C9】______ family increased from 1950 to 1975【C10】______ than the price of cars. For this reason,【C11】______ a new car takes a smaller【C12】______ of a family’s total earnings today.
    In 1951【C13】______ it took 8.1 months of an average family’s【C14】______ to buy a new car. In 1962, a new car【C15】______ 8.3 of a family’s annual earnings. By 1975 it only took 4.75【C16】______ income. In addition, the 1975 cars were technically【C17】______ to models from previous years.
    The【C18】______ of the automobile extends throughout the economy【C19】______ the car is so important to Americans. Americans spend more money【C20】______ their cars running than on any other item.
【C20】
选项 A、starting
B、keeping
C、leaving
D、repairing
答案B
解析 惯用搭配题，keep their cars running属于keep sth. doing这个固定动词短语，意为“保持…继续进行”，所以C正确
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