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成人高等教育 / 有机化学
正确率:100%
醛和酮都含有羰基,所以它们化学性质完全相似
A、正确
B、错误
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有机化学
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题型描述: 十选项完形填空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 _ _ _ _ _ of transportation in all of the United States. It has completely replaced the horse as a means of everyday transportation. Americans use their cars for nearly 90 percent of _ _ _ _ _ personal trips.Most Americans are able to buy cars. The average price of a recently made car was 2,050 in 1950. During this period American car manufacturers set about _ _ _ _ _ their products and work efficiency. _ _ _ _ _ a result, the yearly income of the average family increased from 1950 to 1975 _ _ _ _ _ than the price of cars. For this _ _ _ _ _ purchasing a new car takes a smaller part of a family’s total earnings today.In 1951 proportionately it took 8.1 months of an average family’s yearly income _ _ _ _ _ a new car. In 1962 a new car _ _ _ _ _ 8.3 months of a family’s annual earnings. By 1975 it only took 4.75 months’ income. In addition, the 1975 cars were technically superior to models from previous years.The _ _ _ _ _ of the automobile extends throughout the economy as the car is so important to Americans. Americans spend more money _ _ _ _ _ keeping their cars running than on any other item.1、 A. types B. means C. kinds D. mean 2、 A. many B. all C. few D. enough 3、 A. improving B. reducing C. to reduce D. to improve 4、 A. as B. so C. by D. for 5、 A. slower B. equally C. faster D. less 6、 A. price B. income C. reason D. speed 7、 A. bought B. buys C. to buy D. buying 8、 A. paid B. spent C. cost D. used 9、 A. affect B. notice C. influence D. running 10、 A. of B. to C. in D. for
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