GMAT申友逻辑CR题库-That the application of new technology can increase the productivity of existing coal mines is demonstrated by the case of-破解版08-真题答案解析

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CR88-97题

That the application of new technology can increase the productivity

of existing coal mines is demonstrated by the case of Tribnia's coal industry. Coal output per miner in Tribnia is double what it was five years ago, even though no new mines have opened.

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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答案：

因为新技

术所以per miner（人均）的产量翻倍了。
a. 矿工人数不变，矿产总量翻倍。（可以从题干推出）
b. 矿产总量升高，是因为人均量升高了（还有可能是人数增多）
c.如果有新开的矿，则人均量要大于平均的人均量（因为生产技术和效率不变，所以不应该有这样的结果）
d. 人均量不变，则总量会不变或下降（如果人数增多则未必）
e. 生产的单价降低，与题干完全无关。