首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Energy from Natural Gas 1. Much of the world gets its energy from fossil fuel sources, including coal, oil, and natural gas,
Energy from Natural Gas 1. Much of the world gets its energy from fossil fuel sources, including coal, oil, and natural gas,
admin
2013-04-25
56
问题
Energy from Natural Gas
1. Much of the world gets its energy from fossil fuel sources, including coal, oil, and natural gas, all of which were created millions of years ago.The process began with dead plant and animal matter that collected and over time was buried deep within the earth. There, exposed to extreme pressure and temperatures, the carbon-based material underwent various chemical and physical changes. Some of it became coal, some oil, and some natural gas, depending on the exact conditions it was subjected to.
2. Natural gas is both invisible and odorless. During the first century of the fossil fuel era, it was disregarded as a worthless byproduct of coal and oil. However, people later discovered that it could also be a useful source of energy, and they set about trying to
realize its potential
. Its use began to grow in the twentieth century and has increased rapidly within the last 40 years. Nowadays, natural gas is employed all over the world to heat homes, generate electricity, power factories, and even fuel vehicles.
3. Because it was created through the same process as other fossil fuels, natural gas can often be retrieved from oil fields, something known as an associated source. Coal beds have similarly been known to yield natural gas. In addition, there are isolated deposits containing only gas that are referred to as non-associated sources. To access a subterranean natural gas pocket, a hole is drilled down into it, just as in oil extraction. However, due to the gas’s lightness, it will rise to the surface on its own instead of having to be pumped out.
4. The compound we know as natural gas is actually a
composite
of several different substances, the primary one being methane gas. Each deposit has a unique makeup, but other common components of natural gas include propane, butane, and sulfur. Borrowing terms used in the description of oil, natural gas with a high sulfur content is called "sour" while that with a low content is referred to as "sweet" Regardless of the exact composition, natural gas must be refined to remove its impurities; when ready for use, it is nearly pure methane.
5. Natural gas offers many advantages as a fuel source, the first and most important being that it is extremely clean burning. While oil and coal both have complex molecular structures, methane’s is simple: one carbon atom surrounded by four atoms of hydrogen. The lack of excess particles translates into fewer waste byproducts during combustion. For example, all fossil fuels produce carbon dioxide when burned, but natural gas releases substantially less carbon dioxide than other fuels. Given the major role of carbon dioxide in the acceleration of global warming,
this
is an important attribute. In addition, natural gas emits far less nitrogen and sulfur, which are key contributors to the smog that pollutes the air in metropolitan areas, as well as acid rain.
6. The benefits of natural gas extend far beyond its cleanliness. Since it contains fewer waste particles, its energy can be acquired with much more efficiency than that of the other fossil fuels, meaning a lower overall cost for the consumer. A Another advantage is that natural gas is transported via underground pipelines instead of by ships and trucks.B Finally, natural gas is relatively plentiful and widespread.C Geologists have identified extensive stores in Canada, the United States, Russia, the Middle East, and Australia, among other locations.D With the world’s oil supplies quickly dwindling, it is becoming more important than ever to utilize alternative energy resources such as natural gas.
7. Of course, no energy resource is perfect, and there are some drawbacks to the use of natural gas. Its low density means that it requires larger tanks for storage than oil and coal do, and it is impossible to pipe it across the oceans. Some people have concerns about its safety as well, since its lack of color and smell can make detecting a leak difficult. However, when both its positive and negative characteristics are weighed, it becomes clear that natural gas is perhaps the best energy resource available today.
The word this in the passage refers to
选项
A、oil and coal both have complex molecular structures.
B、all fossil fuels produce carbon dioxide when burned.
C、natural gas releases substantially less carbon dioxide than other fuels.
D、natural gas emits far less nitrogen and sulfur.
答案
C
解析
转载请注明原文地址:https://www.kaotiyun.com/show/ciyO777K
0
托福(TOEFL)
相关试题推荐
Studentsoncourseslastingoverayearareusuallygivenuntil______toleavethecountry.
Studentsoncourseslastingoverayearareusuallygivenuntil______toleavethecountry.
WhatdidKlaraoriginallywanttodoherprojecton?WhatdidKlara’sfriendsuggestincludinginformationon?
"ResearchMethodology"Closescientificmethodbasedonempiricalevidence(=(21))Findaresearchproblemorques
WriteNOMORETHANTWOWORDSforeachanswer.BeWellOnlineProgramme=interactivewebsitewithresourcestohelpreach
WriteNOMORETHANTWOWORDSforeachanswer.BeWellOnlineProgramme=interactivewebsitewithresourcestohelpreach
A、theysawitwasblack.B、theybelievedinthesupernatural.C、theywantedtheinventortobefamous.B
Completethenotesbelow.WriteONEWORDONLYforeachanswer.HydropowerRenewable—constantsource(31)fromnatural
Choosethecorrectletter,A,BorC.Americanboysdropoutofschoolatahigherratethangirlsbecause
随机试题
正常人禁饮10h尿渗透压为:()
咳嗽初起,不宜使用哪类药
女,20岁。咳嗽、胸闷1周。查体:右下肺呼吸音消失。胸部X线片示右侧大量胸腔积液。该患者肺通气功能检查最不可能出现的结果是
某地因工业事故,多人发生CO中毒,其中昏迷者被送到医院。此时最有效的抢救措施是()。
广州利浦公司3月份发生以下经济业务:(1)生产产品领用B材料20000元,车间一般耗用B材料10000元。(2)借入期限为5年的一笔借款100000元,存入银行。(3)摊销应由本月负担的报纸杂志费2000元。(4)结转完工人库产品成本30000元。
下列表述中,正确的有()。
下列各项中,能引起实收资本发生增减变动的有()。
有10个连续奇数,第1个数等于第10个数的,求第1个数是多少?
关于因特网防火墙,下列叙述中错误的是()。
Thehousewasveryquiet,______asitwasonthesideofamountain.
最新回复
(
0
)