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[Critical Reasoning]
试题详情
题目：
Many industrialized nations are trying to reduce atmospheric concentrations of carbon dioxide, a gas released by the burning of fossil fuels. One proposal is to replace conventional cement, which is made with calcium carbonate, by a new “eco-cement.” This new cement, made with magnesium carbonate, absorbs large amounts of carbon dioxide when exposed to the atmosphere. Therefore, using eco-cement for new concrete building projects will significantly help reduce atmospheric concentrations of carbon dioxide.
Which of the following, if true, most strengthens the argument?
Which of the following, if true, most strengthens the argument?
选项:
A、The cost of magnesium carbonate, currently greater than the cost of calcium carbonate, probably will fall as more magnesium carbonate is used 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 practical use.
D、The manufacture of eco-cement uses considerably less fossil fuel per unit of cement than the manufacture of conventional cement does.
E、Most building-industry groups are unaware of the development or availability of eco-cement.
答案:
D
提问：
错选B
解答：
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阅读1043
提问：
错选B
解答：
点赞0
阅读1044
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