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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 months 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、leaving
C、keeping
D、repairing
答案C
解析 此题考查惯用搭配。keep sth．doing是固定动词短语，意为“保持……继续进行”，所以C正确。
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