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
专升本
A recent study described coal as a "bridge to the future". As the most plentiful fossil(化石) fuel in the world, coal has the poss
A recent study described coal as a "bridge to the future". As the most plentiful fossil(化石) fuel in the world, coal has the poss
admin
2019-01-24
73
问题
A recent study described coal as a "bridge to the future". As the most plentiful fossil(化石) fuel in the world, coal has the possibility for filling a growing portion of the demand for energy. But problems cause some trouble to this promising old fuel.
Coal is found around the globe, but three countries—the United States, the Soviet Union and China own nearly two thirds of all known coal reserves.
At present rates of using coal these reserves would last the world more than 200 years, according to the estimates carefully made. Furthermore, scientists think the world probably has 15 times this much coal.
While the United States has the largest share—more than a quarter of the 786 billion tons of known world coal reserves, both the Soviet Union and China produce almost as much coal as the U. S. does.
In addition to the category of known reserves, the U. S. Geological Survey (地质调查所) has calculated that the United States has an estimated 1. 7 trillion (万亿) tons of coal at depths of less than 3,000 feet. Unfortunately, much of this coal is not easy to get with present technology or at present prices.
To produce and use much more coal than we do today, a number of problems will have to be solved: capital at high interest rates, manpower, and transportation, including insufficient rail facilities. Environmental concerns include the proper development of mine sites, possible changes in global climate caused by increased carbon dioxide from burning coal, and the objects that are sent out from coal stacks (烟囱) that wear out buildings, poison lakes, and damage human lungs.
How much coal does the United States have in known coal reserves?
选项
A、786 billion tons.
B、1.7 billion tons.
C、Nearly 200 billion tons.
D、3,000 billion tons.
答案
C
解析
根据文章第三段第一句话While the United States has the largest share—more than a quarter of the 786 billion tons of known world coal reserves,可知786×1/4=196.5,故选C。
转载请注明原文地址:https://kaotiyun.com/show/fVaC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Thecrowdstirredandwhisperedinaweas,onthestage,thehorseslowlytappedoutthebeat.Everyonebecametenseandquieta
Whenallthepeoplehadassembled,theking,surroundedbyhiscourt,【C1】______asignal.Thenadoorbeneathhimopened,andthe
Supposeyouhaveabrickandaspongewhichareexactlythesamesize.Thebrickandthespongewilloccupythesameamountofs
Twohundredyearsago,AmericanstudentswenttoAmericanschools.Likeyou,theystudiedarithmetic,spellingandgeography.Un
Forthispart,youaresupposedtowritealetterofinvitationinEnglishin100-120wordsbasedonthefollowingsituation.Re
WhenAbrahamLincolnwa9alawyerinruralIllinois,heandacertainjudgeintownoncegottobanteringwithoneanotherabout
Japan’s24-hourconveniencestores,alreadystrugglingwithlaggingsalesandgrowth,maysoonfaceyetanotherthreat—movesto
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportantque
Therewasariverwithasmalltownoneithersideofit.Thetownswerelinkedbyabridge.Oneday,aholeappearedinthebri
随机试题
“小说看完了”的主语语义类型属于()
35~110kV变电所设计中,屋外变电站实体围墙不应低于下列哪项数值?()
(2008年)已知矩阵则A的秩r(A)等于()。
非证券金融市场包括()。Ⅰ.外汇市场Ⅱ.融资租赁市场Ⅲ.股权投资市场Ⅳ.证券衍生品市场
下列关于增值税专用发票填开的时间表述正确的有()。
关于消费税的有关规定,下列表述不正确的有()。
一天,一位年轻的妈妈心急如焚地来找心理医生。心理医生招呼她坐下,她急不可待地对医生说:“医生,我的孩子4岁半了,近来表现一反常态。前几天,有位同学来到我家,问他:‘爸爸喜欢你还是妈妈喜欢你?’他说:‘爸爸喜欢你。’弄得这位尚未结婚的朋友(女)满脸尴尬。”“
加拿大《汉和防务评论》杂志刊登题为“从国际装备展览看中国崛起”的文章。该刊主编平可夫结合切身体会,______了20年来中国代表团参加国际防务展的情况及外国同行对其的观感。这位以“中国通”______,也经常受到非议的军事观察家认为,中国军工实力快速提升,
为了使操作系统容易在不同的硬件平台上进行移植,一些嵌入式操作系统使用了HAL技术,它的中文名称是【71】,其原理是取消了操作系统对【72】的直接访问,使操作系统在HAL基础上运行,从而隐藏了硬件平台的差异。
•Lookattheguidelinesbelowaboutstaffappraisal.•Choosethebestwordfromtheoppositepagetofilleachgap.•Foreachqu
最新回复
(
0
)