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本題由lindy提供
That the application of new technology can increase the productivity
Which of the following can be properly concluded from the statement about coal output per miner in the passage?
A. If the number of miners working in Tribnian coal mines has remained constant in the past five years, Tribnia's total coal production has doubled in that period of time.
B. Any individual Tribnian coal mine that achieved an increase in overall output in the past five years has also experienced an increase in output per miner.
C. If any new coal mines had opened in Tribnia in the past five years, then the increase in output per miner would have been even greater than it actually was.
D. If any individual Tribnian coal mine has not increased its output per miner in the past five years, then that mine's overall output has declined or remained constant.
E. In Tribnia the cost of producing a given quantity of coal has declined over the past five years.
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文字解析
因?yàn)樾录?
a. 礦工人數(shù)不變，礦產(chǎn)總量翻倍。 （可以從題干推出）
b. 礦產(chǎn)總量升高，是因?yàn)槿司可吡?（還有可能是人數(shù)增多）
c.如果有新開的礦，則人均量要大于平均的人均量 （因?yàn)樯a(chǎn)技術(shù)和效率不變，所以不應(yīng)該有這樣的結(jié)果）
d. 人均量不變，則總量會(huì)不變或下降 （如果人數(shù)增多則未必）
e. 生產(chǎn)的單價(jià)降低，與題干完全無(wú)關(guān)。
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