Before the 20th century the horse provided day to day transportaition in the United States. Trains were used only for long dista

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问题     Before the 20th century the horse provided day to day transportaition 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 f everyday transportation. Americans use their car for【C3】______90 percent of personal【C4】______
    Most Americans are able to【C5】______cars. The average price of a【C6】______made car was 2, 050 in 1950, 2, 740【C7】______1975. During this period American car manufacturers set about【C8】______their products and work efficiency. As a result, 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 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 to【C20】______their cars running than on any other item.
【C8】

选项 A、raising
B、making
C、reducing
D、improving

答案D

解析
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