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[Critical Reasoning]
试题详情
题目：
Twenty years ago, Balzania put in place regulations requiring operators of surface mines to pay for the reclamation of mined-out land. Since then, reclamation technology has not improved. Yet, the average reclamation cost for a surface coal mine being reclaimed today is only four dollars per ton of coal that the mine produced, less than half what it cost to reclaim surface mines in the years immediately after the regulations took effect.
Which of the following, if true, most helps to account for the drop in reclamation costs described?
选项:
A、Even after Balzania began requiring surface mine operators to pay reclamation costs, coal mines in Balzania continued to be less expensive to operate than coal mines in almost any other country.
B、In the twenty years since the regulations took effect, the use of coal as a fuel has declined from the level it was at in the previous twenty years.
C、Mine operators have generally ceased surface mining in the mountainous areas of Balzania because reclamation costs per ton of coal produced are particularly high for mines in such areas.
D、Even after Balzania began requiring surface mine operators to pay reclamation costs, surface mines continued to produce coal at a lower total cost than underground mines.
E、As compared to twenty years ago, a greater percentage of the coal mined in Balzania today comes from surface mines.
答案:
C
提问：
前面老師的錄音說，因為在surface mine挖的煤比非surface挖的煤占總產量的比例比20年前低，所以攤分每噸煤要付的reclamation cost比20年前低。 可是原文說 the average reclamation cost for a surface coal mine being reclaimed today is only four dollars per ton of coal “that the mine produced”, 那麼就是所有要交reclamation的煤都是從the a surface coal mine挖的，並沒有C說的停止了surface mining，因此也不存在surfacing mine的煤占比下降的情況。請老師再說明一下C為何能回答原文的問題？
解答：
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阅读2963
提问：
前面老師的錄音說，因為在surface mine挖的煤比非surface挖的煤占總產量的比例比20年前低，所以攤分每噸煤要付的reclamation cost比20年前低。 可是原文說 the average reclamation cost for a surface coal mine being reclaimed today is only four dollars per ton of coal “that the mine produced”, 那麼就是所有要交reclamation的煤都是從the a surface coal mine挖的，並沒有C說的停止了surface mining，因此也不存在surfacing mine的煤占比下降的情況。請老師再說明一下C為何能回答原文的問題？
解答：
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阅读2964
提问：
A和别的国家比较，B讲煤的用量下降，E讲煤的来源，不对
剩下CD，因为看到D说到表面的煤开采费用低，就选择了D
解答：
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阅读3047
提问：
我选e了
解答：
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