首页
登录
职称英语
What is the lecture mainly about? [br] According to the professor, what are two
What is the lecture mainly about? [br] According to the professor, what are two
游客
2025-02-04
21
管理
问题
What is the lecture mainly about? [br] According to the professor, what are two ways in which natural gas is preferable to oil and other fossil fuels? Choose 2 answers.
Listen to part of a lecture in an environmental geology class. (P = Professor, J = Jane, T = Tom)
P: OK. Let’s continue our discussion of natural gas. In class yesterday, we said that it is now widely considered to be the fossil fuel of the future, or at least of the next 50—100 years or so. Anybody remembers why? Jane?
J: Urn… it’s probably because it’s a lot more plentiful than oil, right? And… it doesn’t produce as much carbon when it’s burned.
P: Great! It actually emits very little carbon into the air. So it forms much less carbon dioxide in the atmosphere. And that’s because it’s a gas. You see, it efficiently converts its energy content to power… um… much more efficiently than your conventional fossil fuel because gas burns more completely. And also, it goes a lot further in terms of what it can be used for. It can be used to generate electricity, heat homes, run cars… Also proven reserves of methane which is the most important ingredient in natural gas have increased tremendously for the past few years as the exploration goes on. We estimate that just… just taking the reserves we know about… it can last for about a hundred years. Some say even longer. So, what do you think? Pretty promising, right? Um… clean burning, multi-purpose and plentiful supply. But, what’s the drawback? Tom?
T: Well, methane itself is a greenhouse gas, isn’t it? So if it’d find its way into the atmosphere…
P: Right. It could be a contribution to the greenhouse effect in a big way. Um… what else?
J: It’s explosive.
T: And it stinks!
P: Hmm, well, I think there’re ways around that last one. Anyway, what I want us to think about today is… well, as I mentioned earlier, the current reserves of natural gas should be enough to last for a hundred years or more. But that’s not all. You see, there are other newer sources that we’ve only started to… to explore their potential, um… sources that we’ve only recently begun tapping because of technological advances… sources like deep underground sites or… or gas trapped in unusually hard rock. And then there’s another kind of natural gas that we still don’t have the technology to mine. In fact, if we could find out a way to get to it… ah… to extract this unconventional natural gas, it might turn out to be the most abundant source ever found. We’re talking about anywhere from 6 to 13 times the gas currently believed to exist in the world’s proven reserves, maybe more… So naturally the related industry is going crazy about this new source. And, what I’m talking about here is what’s called "methane hydrates”. Methane hydrates are a little crystal that forms when methane combines with molecules of frozen water. Together, they form a kind of an ice-like substance that contains a good amount of methane. Methane hydrates were first discovered in 19th century in the Arctic regions. But now they are found all over the world’s oceans. So it’s no surprise that the energy industry is starting to pay serious attention to them. But the problem is… uh, we’re still in the beginning stages of the research process. Little research was done on it until recently. So nobody really knows how to begin extracting the methane from methane hydrates, or how much methane we could get. We also don’t know how the extraction process might affect the environmental consequences. I mean, these hydrates are stable now as long as they’re kept cool and pressurized. But if we start messing them up, well, we really don’t know yet just what might happen. The consequences might be something we’d never think of. Careless pursuit of mining could precipitate the release of a great amount of methane into the atmosphere. And methane, as we’ve already noted, is a powerful greenhouse gas. And this could easily happen when we drill into the ocean floor and thereby create an underwater landslide. See, the sediments on the ocean floor are unstable because they’re mixed in with methane hydrates. So, they’re prevented from solidifying. And if there were an undersea landslide, the methane hydrates could mix with the ocean water, melt and release methane into the atmosphere. Tom?
T: Well, you… you said something about these hydrates being stable as long as they remain cool and under pressure, right? So… I’m thinking, you know, with the global warming and all…
P: That’s an excellent point! Tom. In fact, I happen to be one of those scholars who believe that about 250 million years ago, methane hydrates were released under similar circumstances to what we’re experiencing with global warming and climate change today. And these methane hydrates actually were responsible for the largest mass extinction in Earth’s history when more than 90 percent of all life on earth died out. So to get back to Tom’s point, with today’s global warming causing ocean temperature to rise, and those methane hydrates… well could it happen again?
选项
A、It can be extracted more easily.
B、It burns more cleanly.
C、It is more versatile.
D、It is safer to transport.
答案
B,C
解析
题目询问天然气比石油和其他化石燃料优越的两个方面。教授对天然气优点的总结为:clean burning, multi-purpose and plentiful supply“清洁的燃料,用途多,供应充足”,对应的是B项“燃烧得更干净”和C项“它更通用”。A项“它更容易被提取”和D项“运输更安全”均在讲座中找不到依据。
转载请注明原文地址:https://tihaiku.com/zcyy/3942133.html
相关试题推荐
Whatisthelecturemainlyabout?[br]Whydoestheprofessordiscussdamagesto
Whatisthelecturemainlyabout?[br]Accordingtotheprofessor,whatinformat
Whatisthelecturemainlyabout?[originaltext]Listentopartofalectureina
Whatisthelecturemainlyabout?[br]Listenagaintopartofthelecture.Then
Whatisthelecturemainlyabout?[br]Whatistheprofessor’sopinionaboutthe
Whatisthelecturemainlyabout?[br]Accordingtotheprofessor,whatcouldha
Whatisthelecturemainlyabout?[br]Whatdoestheprofessorimplyaboutsuppl
Whatisthelecturemainlyabout?[br]Accordingtotheprofessor,whataretwo
Whatisthelecturemainlyabout?[originaltext]Listentopartofalectureina
Whydoesthestudentgotoseethedirector?Choose2answers.[br]Accordingto
随机试题
Manysmallculturalgroupsliveinplacesfarawayfrommoderncities.Som
Pruderyactuallydrawsattentiontotheviceitissupposedto(i)____;thevery
Allofthefollowingarewell-knownfemalewritersinthe20thcenturyBritainE
说明:Shell公司现招聘一名经理助理,请按照下列要求写一则招聘广告。内容:1.30岁以下,男性;2.经济学专业,专科学历及以上;3.两年销售经验;4
Atsometimeinyourlifeyoumayhaveastrongdesiretodosomethingstran
患者,女性,35岁。发现糖尿病3年。因外阴瘙痒严重,影响睡眠前来就诊。妇科检查:
单核细胞特有的是A.CD7B.CD10C.CD14D.CD19E.CyCD22
共用题干 1.Twoformerloversaretogetmar
共用题干 一般资料;求助者,男性,40岁,某机关处级干部。案例介绍:求助者10
(2011年真题)暗挖施工中防水效果差的工法是()。A.全断面 B.中隔壁法
最新回复
(
0
)