4月1日考，请教prep上的一题逻辑题，帮忙啊

AccyFin

GWD1-Q14:
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.
我选的是B， 我觉得B就是题干的逆否命题啊，为什么错了，还是不懂这些题应该怎么做，也看不懂lawyer得方法。

sdfzcjy

GWD1-Q14:
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.
我选的是B， 我觉得B就是题干的逆否命题啊，为什么错了，还是不懂这些题应该怎么做，也看不懂lawyer得方法。

-- by 会员 AccyFin (2011/3/23 13:28:53)

选A吧
新技术增加效率，每个矿工的产出翻了一倍比5年前，即使没有开新矿。
问文章能推出下面哪个选项，选最不可能错的

A. 矿工数量保持不变的话，总产出保持double
output per miner * miner数 = 总output
又miner数不变，output per miner is double，所以，总output is double
B.individual Tribnian coal mine文章没有提，这mine的output和output per miner 没有告诉怎么变化，所以不是确定的，可能有错

A/B比较，A比B好

总的说，这类型题目选最不可能错的吧

Summer明明

选C把，B只是把事实又陈述了一遍。题目说产量增长是因为新技术的应用。因此即使没有开发新矿区每个矿工的产量也翻倍了。很自然地推出如果开发了新矿区，每个矿工产量一定更多。

sdfzcjy

C说开新矿，那么output per miner 会上升，这不一定吧，只能说output有可能会上升，如果说开的新矿水准很差，那么output per miner 还有很能下降呢

AccyFin

谢谢二楼三楼的朋友，答案是A, 我终于搞明白了，之前没有意识到miner是矿工的意思，如果产量的增加是因为矿工的人数的增加，就与题目的statement相违背了，所以B不对。

Summer明明

嗯，我学到了呢~

bonfin

GWD1-Q14:
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.
我选的是B， 我觉得B就是题干的逆否命题啊，为什么错了，还是不懂这些题应该怎么做，也看不懂lawyer得方法。

-- by 会员 AccyFin (2011/3/23 13:28:53)

选A吧
新技术增加效率，每个矿工的产出翻了一倍比5年前，即使没有开新矿。
问文章能推出下面哪个选项，选最不可能错的

A. 矿工数量保持不变的话，总产出保持double
output per miner * miner数 = 总output
又miner数不变，output per miner is double，所以，总output is double
B.individual Tribnian coal mine文章没有提，这mine的output和output per miner 没有告诉怎么变化，所以不是确定的，可能有错

A/B比较，A比B好

总的说，这类型题目选最不可能错的吧

-- by 会员 sdfzcjy (2011/3/23 14:00:07)

正解，up