592. Many industrialized nations are trying toreduce atmospheric concentrations of carbon dioxide, a gas released by theburning of fossil fuels. One proposal is to replace conventional cement, whichis made with calcium carbonate, by a new “eco-cement.” This new cement, madewith magnesium carbonate, absorbs large amounts of carbon dioxide when exposedto the atmosphere. Therefore, using eco-cement for new concrete buildingprojects will significantly help reduce atmospheric concentrations of carbondioxide.
Which of the following, if true, most strengthensthe argument?
(A) The cost of magnesium carbonate, currentlygreater than the cost of calcium carbonate,probably will fall as more magnesium carbonate isused in cement manufacture.
(B) Eco-cement is strengthened when absorbed carbon dioxide reacts with the cement.
(C) Before the development of eco-cement,magnesium-based cement was considered too susceptible to water erosion to be of practicaluse.
(D) The manufacture of eco-cement usesconsiderably less fossil fuel per unit of cement than the manufacture of conventional cement does.
(E) Most building-industry groups are unaware ofthe development or availability of eco-cement.贝西文迅 发表于 2017-10-19 16:32
分析过程:题目属于方案推理。
目标:降低大气中的CO2,方案:用Eco(环保型)水泥替代传统型。理由:环保 ...
欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |