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 Tribina 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 Tribnia 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 Tribnia 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 acturally 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.
我选了C，答案是A
谢谢各位了~~
Again, whenever we encouter the "inferred" or "must be true" cr, do keep in mind that everything said in the correct option has to be said already in the main paragraph. In addtion, the answer is usually just a well-disguisded replica of one or two sentences enclosed in the main paragraph.
Here onto the question:
Without A, C is the common logical choice. However, we can not, for 100% sure, guarantee that increase would have been greater only based on such info as "even though no new mines have opened". Thus, C is incorrect only for that matter and is indeed a beautiful trap.
Now onto A, like said earlier, A just repeats what has been said in "output per miner in Tribina is double what it was five years ago".
Hope that would help
题意为：新科技的运用可以增加生产率，这个论断已经被T的案例所证明，因为即使没有new mines开发，现在每个miner的产量也是五年前的两倍。
此题要把逻辑意思缩减为，因为现在T的人均产值是五年前的两倍，所以科技可以促进生产力，
那么就是要突出是科技的作用，而不是别的作用，那么肯定要排除其他的原因，比如，他们没有增加新的工人，没有开采新的矿（这个已经在题目中排除)
选项A就是此意
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 acturally was.
C说如果过去五年中在T开发一个新的mine，人均产量就会比现在更高
这句话显然没有强调科技的作用，而是突出了新开矿对增长饿得贡献，显然不能选
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