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.

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情景：略

推理：通过问题问法可知，本题不是要我们去评估推理文段。因此，本题为必然性推理。

选题方式：略

选项分析：

A选项：Correct. 如果在Tribnian煤矿工作的工人的数量没有变化的话，Tribnian的总煤产量在同期应该上涨了两倍。推理文段指出，人均产量上涨两倍，且没有新的矿，如果人数没有变化，那么由于“总量=人均X人数”，所以总量也应该上涨了两倍。

B选项：任何一个在过去5年间总产量上涨的煤矿，人均产量也上升了。总量和人均以及人数的关系是无法从推理文段中得知的。

C选项：如果任何一个新的煤矿过去五年在Tribnian开采，那么人均开采量的增长会比它实际的要快。现有的煤矿的人均开采量上升不等于新煤矿人均开采量的提升。

D选项：如果任何一个Tribnian的煤矿人均开采量在过去五年没有增长，那么其总量也一定会下降或者保持不变。总量和人均以及人数的关系是无法从推理文段中得知的。

E选项：在Tribnian，生产单位数量的煤的成本在过去五年下降了。推理文段没有提到成本的问题，产出高和低与成本之间无必然关系。

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