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A．It made the subways much quieter.
B．It brought electric light to the tunnels.
C．It allowed passengers to breathe cleaner air in the tunnels.
D．It allowed subways to be repaired inexpensively.

参考答案C
解析:According to the professor, what major advantage for the subway did electricity offer?
细节题。根据It solved one problem that the early English subways suffered from，unbearable smoke of steam engines that made breathing in the subway tunnels almost impossible．可知电车的出现使得地铁更换了动力，不再以蒸汽机为动力，解决了人们在地铁上难以呼吸的问题。因此，正确答案是C。
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单选题Questions are based on the following passage.
The American 26 system, is organized around a basically private-enterprise, market-oriented economy in which 27 largely determine what shall be produced by spending their money in the marketplace for those goods and services that they want most. Private businessmen,28 to make profits, produce these goods and services in 29 with other businessmen; and the profit motive, operating under competitive pressures, largely determines how these goods and services are produced.Thus, in the American economic system it is the demand of individual consumers,30 with the desire of businessmen to 31 profits and the desire of individual to maximize their incomes, that together determine what shall be produced and how resources are used to produce it.
An important factor in a market-oriented economy is the 32 by which consumer demands can be expressed and responded to by producers. In the American economy, this mechanism is provided by a price system, a process in which prices rise and fall in 33 to relative demands of consumers and supplies offered by seller-producers. If the product is in 34 supply relative to the demand, the price will be bid up and some consumers will be eliminated from the market. If, on the other hand, producing more of a commodity results in reducing its cost, this will tend to increase the supply offered by seller-producers, which in turn will lower the price and permit more consumers to buy the product. Thus, price is the 35 mechanism in the American economic system.
A. Competition
B. maximize
C. short
D. coupled
E. individual
F. response
G. Eliminated
H. private
I. economic
J. Striving
K. regulating
L. mechanism
M. Consumers
N. political
O. Results
第（26）题选

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