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
30
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
Farmanimalsprovidemanwithfoodandmaterialforclothing,leatherandotherproducts.Some,suchashorsesandoxen,provide
Tofindoutwhattheweatherisgoingtobe,mostpeoplegostraighttotheradio,televisionornewspapertogetanexpertweat
RonaldMusokeisacollegestudentfromUganda.HeattendstheCollegeofMarininCalifornia.Recentlyhegotveryexcitedabou
Forthispart,youaresupposedtowritealetterinEnglishin100-120wordsbasedonthefollowinginformation.Rememberto
Enoughsleepisimportanttohealth.Theamountofsleep【C1】______dependsontheageofthepersonandtheconditionsinwhichs
Peopleareusedtospeakingtheirnativelanguage,soimmigrantsarehavingmanyproblemsbetweenthefirstgenerationandthes
Atfirstglance,therehardlyseemstobeanycomparisonbetweenRavennaandRome,butbackinthe5thcentury,itwasRavennat
In1993,NewYorkStateorderedstorestochargeadepositonbeverage(饮料)containers.Withinayear,consumershadreturnedmill
Letmetakethis______tothankyoupubliclyforallyouhavedoneforourcompany.
Theyoungmanlosthisjoblastmonth,butitwasn’tlong______hefoundanewpositioninmycompany.
随机试题
弯制口外弓的外弓用
采取正确印模的要求是
小儿舌体肿大,板硬麻木,舌色深红,其病机是
(共用备选答案)A.胃酸过多、烧心B.关节痛、神经痛C.手足癣、体癣、股癣、头癣D.蛔虫病、蛲虫病E.无痰干咳、频繁剧烈的咳嗽在非处方药中西咪替丁的适应证是
对()的试运转应编制试运转方案。
某施工单位承接了某市办公楼的消防设施安装工程,该工程主要包括室内外消火栓系统、自动喷水灭火系统、通风与防排烟系统及灭火器等消防设施。工程项目开工后,施工单位采购的消防设施、组件与材料陆续到达现场,现场项目部邀请监理单位、建设单位共同对消防设施进行验收。工程
基金信息披露的作用主要表现为()。
下列职位中,我国《宪法》没有规定连任不得超过两届的是()。
Whichoffollowingisthebesttitleofthetext?
Learningtoplayamusicalinstrumentcanchangeyourbrain,accordingtoaUSreview.Italsofindsthatmusictrainingcanlea
最新回复
(
0
)