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
Renewable Energy Sources Today petroleum provides around 40% of the world’s energy needs, mostly fuelling automobiles. Coal is
Renewable Energy Sources Today petroleum provides around 40% of the world’s energy needs, mostly fuelling automobiles. Coal is
admin
2012-12-03
57
问题
Renewable Energy Sources
Today petroleum provides around 40% of the world’s energy needs, mostly fuelling automobiles. Coal is still used, mostly in pover stations, to cover one-quarter of our energy needs, but it is the least efficient, unhealthiest and most environmentally damaging fossil fuel. Natural gas reserves could plug some of the gap from oil, but reserves of that will not last into the 22nd century either. Most experts predict we will exhaust easily accessible reserves within 50 years. We could fast reach an energy crisis. We need to rapidly develop sustainable solutions to fuel our future. Less-polluting renewable energy sources offer a more practical long-term energy solution. They may benefit the world’s poor too. “Renewable” refers to the fact that these resources are not used faster than they can be replaced.
Hydroelectric power is now the most common form of renewable energy, supplying around 20% of world electricity. China’s three gorges Dam, which has just been completed, is the largest ever. At five times the size of the US’s Hoover Dam, its 26 turbines will generate the equivalent energy of 18 coal-fired power stations. It will satisfy 3% of China’s entire electricity demand.
In 2003, the first commercial power station to harness tidal currents in the open sea opened in Norway. It is designed like windmill, but others take the form of turbines.
As prices fall, wind power has become the fastest growing type of electricity generation –quadrupling worldwide between 1999 and 2005. Modern wind farms consist of turbines that generate electricity. Though it will be more expensive, there is more than enough wind to provide the world’s entire energy needs. Wind farms come in onshore and offshore forms. They can often end up at spots of natural beauty, and are often unpopular with residents. And turbines are not totally benign – they can interfere with radar and leave a significant ecological footprint, altering climate and lilling sea birds. Migrating birds may have more luck avoiding them. Scotland is building europe’s largest wind farm, which wil power 200,000 homes. The UK’s goal is to generate onefifth of power from renewable sources, mainly wind, by 2020. But this may cause problems, because wind is unreliable.
China’s Three Gorges Dam
选项
A、is the first hydroelectric dam in the world.
B、is of the same size as the US’s Hoover Dam.
C、can generate around 3% of world electricity.
D、is the largest hydroelectric dam in the worl
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/nYQd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
ABiologicalClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalcloc
EffectsofExerciseonElderlyDiabetics(糖尿病人)Mostolderpeoplewith.so-calledtype2diabetes(糖尿病)couldstoptakingins
"Don’tDrinkAlone"GetsNewMeaningInwhatmaybebadnewsforbarsandpubs,anEuropeanresearchgrouphasfoundthatpe
Organicfood:Why?1.Europeisnowthebiggestmarketfororganicfoodintheworld,expandingby25percentayearoverth
Theoldcarjoltedalongthecountryroadatasnail’space.
MigrantWorkersInthepasttwentyyears,therehasbeenanincreasingtendencyforworkerstomovefromonecountrytoanot
EatingPotatoesGivesYourImmuneSystemaBoostEatingpotatoesisnotonlygoodforbowelhealth,butalsoforthewholei
InterviewTheimportanceandfocusoftheinterviewintheworkoftheprintandbroadcastjournalistarereflectedinsever
Themanagergotangryjustbecausehissecretarywastenminuteslate.
Ifyouhaveanycomplaintpleaseseethemanager.
随机试题
总量为150ml的溶液中,加入10%氯化钾的量最多为
下列哪种诊断最不可能该患者如需确诊,下列哪项检查意义最小
30岁男性,急性阑尾炎住院,现腹痛转至右下腹。查体:右下腹压痛,伴抬手痛及肌紧张。其腹痛的发生机制是
顶管所用的附属工具是工具管,工具管是顶管的关键机具,一般应具有的功能不包括()。
航站楼计算机信息管理系统是以航班信息为主,对涉及机场生产指挥和地面服务的各种信息进行处理,使航站楼各项事务管理的信息()。
采用低正常股利加额外股利政策的理由是()。
2×17年1月,甲公司取得乙公司20%有表决权股份,能够对乙公司施加重大影响。2×17年6月,甲公司将其账面价值为1200万元的商品以1800万元的价格出售给乙公司,乙公司将取得的商品作为管理用固定资产核算,并于当月投入使用,预计使用寿命为10年,采用年限
国际电话与电报咨询委员会(CCITT)将媒体分为哪几类?
《合同法》第68条规定:“应当先履行债务的当事人,有确切证据证明对方有下列情形之一的,可以中止履行:……”民法理论称此种权利为()。
この道具はねじを締めるのに使います。締める
最新回复
(
0
)