请教一道逻辑题

paige123

今天做了gwd第一套，看着错题，差点没打击死。。。这才是第一套啊，，还有好多重题才做成这样，以后可怎么办啊。。这里有一个逻辑题搞不太懂，想请问各位大侠一下，btw，那个24套题的逻辑答案讲解是不是不全啊？有几个题没搞懂答案也没解释。。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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D为什么不对？A为什么对？谢谢大家了

eshopaholic

A.很明确呀，总产量=每个工人的产量*工人数量，若人数不变且Coal output per miner in Tribnia is double，则总产量double

D. 与题干矛盾If any individual Tribnian coal mine has not increased its output per miner，

paige123

谢大侠

teddybearj4

这道题目其实还挺好做的~
首先看问题知道他肯定是一道must be true题。
再看题干：
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.

单位miner的产量double，总mine数不变。

A.If the number of miners working in Tribnian coal mines has remained constant in the past five years,（miner数不变）
Tribnia’s total coal production has doubled in that period of time.（那么产量一定是原来的两倍呀！）

BTW，LZ为什么要在语法版题逻辑问题~==

paige123

哈哈 谢了，我以为这是数学和那个机经版呢。。。晕死了