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单项选择题

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 (26) of transportation in all of the United States. It has completely (27) the horse as a means f everyday transportation. Americans use their car for (28) 90 percent of personal (29)
Most Americans are able to (30) cars. The average price of a (31) made car was 2, 050 in 1950, 2, 740 (32) 1975. During this period American car manufacturers set about (33) their products and work efficiency. As a result, the yearly income of the (34) family increased from 1950 to 1975 (35) than the price of cars. For this reason (36) a new car takes a smaller (37) of a family’s total earnings today.
In 1951 (38) it took 8 months of an average family’s (39) to buy a new car.
In 1962 a new car (40) 8.3 of a family’s annual earnings. By 1975 it only took 4.75 (41) income. In addition, the 1975 cars were technically (42) to models from previous years.
The (43) of the automobile extends throughout the economy (44) the car is so important to Americans. Americans spend more money to (45) their cars running than on any other item.
A．kinds
B．sort
C．mean
D．types
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