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本题由chris提供
3295 次学习

Electric utilities pay less for low-quality coal per ton delivered

than for high-quality coal. Yet more low-quality coal than high-quality coal must be burned to generate the same amount of electricity. Moreover, per ton of coal burned, low-quality coal generates more ash than does high-quality coal, and the disposal of ash is becoming more and more expensive.


The considerations above, if true, most strongly support which of the following claims?



    A. A coal-burning utility might not be assured of benefiting economically by always adhering to the policy of keeping its overall coal purchasing costs as low as possible.

    B. In those regions where the cost of disposing of coal ash is negligible, it is more expensive for coal-burning utilities to use high-quality coal than low-quality coal.

    C. Transportation costs represent a smaller proportion of the cost per delivered ton for low-quality coal than for high-quality coal.

    D. It is no less expensive to dispose of a ton of coal ash that results from the burning of high-quality coal than it is to dispose of a ton of coal ash that results from the burning of low-quality coal.

    E. In regions where coal-ash disposal is the least expensive, reserves of low-quality coal are likely to decline at a faster rate than are reserves of high-quality coal.


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答案:
A
低质煤的价
格比高质煤低。但产生相同电力需要更多低质煤。低质煤燃烧后产生更多灰,处理这些灰也更贵。 结论题 A. 总用低质煤的政策使买煤成本低可能不能保证获利; 符合逻辑链,原文后半部分对此给出了充分解释,正确 B. 在处理煤灰成本小的地方,用高价煤更贵;没考虑产生电力需要更多低质煤的因素,排 C. 谈低质煤和高质煤的运输成本占比的比较;原文没提运输成本,无关比较,排 D. 高质煤和低质煤燃烧后的每吨煤灰处理成本相当;原文没提到每吨灰的处理成本,排 E. 在煤灰处理成本低的地方,低质煤的储存量下降更快;无根据推理,排

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