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?
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.
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.
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.
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.
In Tribnia the cost of producing a given quantity of coal has declined over the past five years.无关[
答案为A 没有疑问
我想请大家看看 我做这个归纳题其它选项的排除对不对 谢谢
B没有提到Any individual Tribnian coal mine that achieved an increase in overall output in the past five years 无关
CIf any new coal mines had opened in Tribnia in the past five years,与原文矛盾 错 而且从原文得不出开新矿 工人的生产率提高
D从原文得不出if ..then的关系
E无关概念 | 
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发表于 2004-11-1 10:24:00
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