这题大家不觉得其他项比答案C也没差吗？

frankzhiwei

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?



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.

感觉有点irrelevant，求解释~~

judydongxueni

其他选项无关啊

aomeisoft7

没看懂题目。。谁翻译下？

sugaryun

20年前，B地区制定了一项法规要求露天矿为采空区的复垦买单。这20年中复垦技术没有得到改进。而今天B地区正在进行复垦的露天矿所付的平均复垦费用才4美/吨煤，只相当于20年前费用的一半还不到。
问：选项哪个最说明了复垦费用的下降？

选项C：B地区在山区的露天矿复垦费用特别高，但它们基本上都在政策出台后停产了。（所以剩下的矿都是复垦费用低的了）。C为正确选项。原题中说“复垦技术没有得到改进”就排除了技术因素导致的费用下降。
A：跟其他国家比，属无关选项
B：对煤的需求减少了，不能影响平均的复垦费用
D：跟地下开采矿比，属无关选项
E：露天矿产煤比以前多了，仍然不能影响平均复垦费用

aaintw

询问E选项……煤的产量不是增加了吗？所以平均一下费用降低，为什么是错的……

colasama

回楼上。

没有说费用是固定不变的，莫臆想。说不定开矿越多的同时费用越多。


另外，提醒一下。e只是说占比例大了，没有说绝对产量大了。这些细节不注意要吃亏的

aaintw

哇楼上同学又是你回复的耶~灰墙感动！谢！