【单选题】{{B}}Passage Two{{/B}}
The idea is simple.Air would be blown over a liquid solution which would absorb the carbon dioxide. The carbon dioxide would then be extracted and subjected to chemical reactions that would turn it into fuel.Although they have not yet built a fuel factory, or even a small prototype, the scientists say it is all based on existing technology. "Everything in the concept has been built, is operating or has a close cousin that is operating,"Dr. Martin saiD、The proposal does not violate any laws of physics, and other scientists have independently suggested similar ideas.
In the efforts to reduce humanity’s emissions of carbon dioxide, three solutions have been offered; hydrogen-powered cars, electric cars and biofuels.Biofuels are gasoline substitutes produced from plants like corn or sugar cane. Plants absorb carbon dioxide as they grow, but growing crops for fuel takes up wide strips of lanD、Hydrogen-powered cars emit no carbon dioxide, but producing hydrogen requires energy, and if that energy comes from coal-fired power plants, then the problem has not been solveD、The problem with electric cars is that they have typically been limited to a range of tens of miles as opposed to the hundreds of miles that can be driven on a tank of gas.
Gasoline, it turns out, is an almost ideal fuel (except that it produces carbon dioxide). If it can be made out of carbon dioxide in the air, the LosAlamos concept may mean there is little reason to switch, after all.
"It’s definitely worth pursuing," said Martin I. Hoffert, a professor of physics at New York University. "It has a couple of pieces to it that are interesting." Other scientists also said the proposal looked promising but could not evaluate it fully because the details had not been publisheD、
B．compare different energy sources
C．stress the importance of gasoline
D．discuss solutions to global warming
网考网参考答案：A
网考网解析：
全文重点介绍汽油为什么是完美的燃料。第一段简要陈述这个新概念。第二段对新概念进行详细的解释和阐述。第三段列举出现在解决全球变暖的几项方案，并指出这些方案所存在的问题。最后一段，通过其他科学家对这个概念的评述，再一次给予肯定。故选A。其他选项均不是原文的重点。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
发布评论 查看全部评论