A car is, nevertheless, a miracle if it is used to thefull. It is an unremarked wonder that this complex machine, containing about 5000 parts, some of which work to tolerances of l/1000th of an inch or less, comes into the hands of completely untrained owners, depends on them for care and upkeep, and yet goes on working efficiently year after year. In a laboratory or workshop such a valuable device could be controlled by a skilled operator, and it is a tribute to the motor industrys designers and engineers that so little mechanical trouble is experienced by the owners of Britains nine million cars.
21. Because of the existence of cars_______.
A. fewer railways are built B. fewer people can use their feet
C. more people go abroad D. fewer people can ride horses
22. The writer says that, at the wheel, the driver_______.
A. acts responsibly
B. has obligations to exploit his advantages
C. has obligations to help other road users
D. has obligations to be patient, skillful, and sober
23. Many families_______.
A. are financially responsible concerning cars
B. are financially irresponsible concerning cars
C. buy a car only after they have bought a house
D. spend more on a car than on almost anything else
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