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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 1950to 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.
【C19】
选项 A、then
B、as
C、so
D、which
答案B
解析 逻辑衔接题。分析句意可知，前后两部分是因果关系，后面是因，前面是果，所以应选能引导原因状语从句的词，故选B。
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