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
A = Hydro power B = Nuclear power C = Solar power D = Wind power Which power(power’ s)... was developed to provide electricity
A = Hydro power B = Nuclear power C = Solar power D = Wind power Which power(power’ s)... was developed to provide electricity
admin
2014-01-27
52
问题
A = Hydro power B = Nuclear power C = Solar power D = Wind power
Which power(power’ s)...
was developed to provide electricity for satellites at the beginning? 【P1】______
can promote tourism development? 【P2】______
may give off dangerous radioactive pollution into the air? 【P3】______
may affect the downstream water quality and have an impact on plant life? 【P4】______
stations can increase to full power very quickly? 【P5】______
produces small amounts of waste? 【P6】______
is a good method of supplying energy to remote areas? 【P7】______
provides around 20% of the world’ s electricity? 【P8】______
can be used to heat your water at home instead of so much gas or electricity? 【P9】______
is not renewable? 【P10】______
A
Hydro power
Introduction
We have used running water as an energy source for thousands of years, mainly to grind corn.
The first house in the world to be lit by hydroelectricity was Cragside House, in Northumberland, England, in 1878. In 1882 on the Fox River, in the USA, hydroelectricity produced enough power to light two paper mills and a house.
Nowadays there are many hydro-electric power stations, providing around 20% of the world’ s electricity. The name comes from "hydro" , the Greek word for water.
How it works
A dam is built to trap water, usually in a valley where there is an existing lake.
Water is allowed to flow through tunnels in the dam, to turn turbines and thus drive generators.
Advantages
Once the dam is built, the energy is virtually free.
No waste or pollution produced.
Much more reliable than wind, solar or wave power.
Water can be stored above the dam ready to cope with peaks in demand.
Hydro-electric power stations can increase to full power very quickly, unlike other power stations.
Disadvantages
The dams are very expensive to build.
Building a large dam will flood a very large area upstream, causing problems for animals that used to live there.
Finding a suitable site can be difficult—the impact on residents and the environment may be unacceptable.
Water quality and quantity downstream can be affected, which can have an impact on plant life.
Is it renewable?
Hydro-electric power is renewable.
The Sun provides the water by evaporation from the sea, and will keep on doing so.
B
Nuclear power Introduction
Nuclear power is generated using Uranium, which is a metal mined in various parts of the world.
The first large-scale nuclear power station opened at Calder Hall in Cambria, England, in 1956.
Some military ships and submarines have nuclear power plants for engines.
How it works
Nuclear power stations work in pretty much the same way as fossil fuel-burning stations, except that a "chain reaction" inside a nuclear reactor makes the heat instead.
The reactor uses Uranium rods as fuel, and the heat is generated by nuclear fission. Neutrons smash into the nucleus of the uranium atoms, which split roughly in half and release energy in the form of heat.
Carbon dioxide gas is pumped through the reactor to take the heat away, and the hot gas then heats water to make steam.
Advantages
Nuclear power costs about the same as coal, so it’ s not expensive to make.
Does not produce smoke or carbon dioxide, so it does not contribute to the greenhouse effect.
Produces huge amounts of energy from small amounts of fuel.
Produces small amounts of waste.
Disadvantages
Although not much waste is produced, it is very, very dangerous.
It must be sealed up and buried for many years to allow the radioactivity to die away.
Nuclear power is reliable, but a lot of money has to be spent on safety.
Is it renewable?
Nuclear energy from Uranium is not renewable.
Once we’ ve dug up all the Earth’ s uranium and used it, there isn’ t any more.
C
Solar power
Introduction
We’ ve used the Sun for drying clothes and food for thousands of years, but only recently have we been able to use it for generating power.
The Sun is 150 million kilometers away, and amazingly powerful.
Just the tiny fraction of the Sun’ s energy that hits the Earth(around a hundredth of a millionth of a percent)is enough to meet all our power needs many times over.
How it works
There are three main ways that we use the Sun’ s energy:
Solar Cells(really called "photovoltaic" or "photoelectric" cells)that convert light directly into electricity.
In a sunny climate, you can get enough power to run a 100W light bulb from just one square meter of solar panel.
This was originally developed in order to provide electricity for satellites, but these days many of us own calculators powered by solar cells.
Solar water heating, where heat from the Sun is used to heat water in glass panels on your roof.
This means you don’t need to use so much gas or electricity to heat your water at home.
Solar Furnaces use a huge array of mirrors to concentrate the Sun’ s energy into a small space and produce very high temperatures.
Advantages
Solar energy is free—it needs no fuel and produces no waste or pollution.
In sunny countries, solar power can be used where there is no easy way to get electricity to a remote place.
Handy for low-power uses such as solar powered garden lights and battery chargers.
Disadvantages
Doesn’ t work at night.
Very expensive to build solar power stations.
Solar cells cost a great deal compared to the amount of electricity they’ 11 produce in their lifetime.
Can be unreliable unless you’ re in a very sunny climate.
Is it renewable?
Solar power is renewable. The Sun will keep on shining anyway, so it makes sense to use it.
D
Wind power
Introduction
We’ ve used the wind as an energy source for a long time. The Babylonians and Chinese were using wind power to pump water for irrigating crops 4, 000 years ago, and sailing boats were around long before that.
Wind power was used in the Middle Ages, in Europe, to grind corn, which is where the term "windmill" comes from.
How it works
The Sun heats our atmosphere unevenly, so some patches become warmer than others.
These warm patches of air rise, other air blows in to replace them—and we feel a wind blowing.
We can use the energy in the wind by building a tall tower, with a large propeller on the top. The wind blows the propeller round, which turns a generator to produce electricity.
The more towers, the more wind, and the larger the propellers, the more electricity we can make.
Advantages
Wind is free, wind farms need no fuel.
Produces no waste or greenhouse gases.
The land beneath can usually still be used for farming.
Wind farms can be tourist attractions.
A good method of supplying energy to remote areas.
Disadvantages
The wind is not always predictable—some days have no wind.
Suitable areas for wind farms are often near the coast, where land is expensive.
Can kill birds—migrating flocks tend to like strong winds.
Can affect television reception if you live nearby.
Is it renewable?
Wind power is renewable. Winds will keep on blowing; it makes sense to use them.
【P2】
选项
A、
B、
C、
D、
答案
D
解析
由D中的advantage中的第四句话“Wind farms can betourist attractions.”可知答案为D。
转载请注明原文地址:https://kaotiyun.com/show/kVXd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
______islocatedintheheartofGreenwichVillage?______offersopportunitiestovisitAmericanhomes?
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarmingh
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarmingh
Theworld’sfirstworkers’compensationlawwasintroducedbyBismarck______.OneoftheproblemstheAmericaninjuredworkers
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarming
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarming
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.
______andZairedonotborderEthiopia?______dependsonbothfarmingandmining?
PresidentBushintendstoprovideillegalimmigrantswithanopportunitytogetlegalresidencyorAmericancitizenship.
WhatfoodisnotprovidedformostBritishchildrenatschool?
随机试题
副溶血弧菌所致细菌性食物中的主要污染食品来自()。
甲公司是一家国有控股上市公司,采用经济增加值作为业绩评价指标,目前,控股股东正对甲公司2014年度的经营业绩进行评价,相关资料如下。(1)甲公司2013年末和2014年末资产负债表如下:(2)甲公司2014年度利润相关资料如下:(3)甲公司201
1844年7月3日,中美第一个不平等条约《望厦条约》的签署地是澳门的()。
2017年2月17日,某县公安局发出通知,现将上半部分摘录如下:“2017年2月6日至2月12日我辖区内发生一系列针对出租车的砸车窗盗窃车内财物案件,给人民群众的财产带来较大的损失,公安局提醒广大群众提高防范意识,积极配合公安机关做好打击防控工作。一、
“社会一旦有技术上的需要,则这种需要比十所大学更能把科学推向前进。”这表明()。
中国人对知识与思想、文风与人品、政治与学术,向来很难划开一道理性的界限,把本来只是经验和感觉的判断,常常当成评价一切的铁律。其实,元好问早就说“心画心声总失真,文章宁复见为人”,刘因也曾说“若将字字论心术,恐有无边受屈人”。以下观点与原文意思最相
古人把东、西、南、北四方中的每一方想象为四种动物形象,叫作四象。四象在中国传统文化中指青龙、白虎、朱雀、玄武,分别代表东西南北四个方向。它源于中国古代的:
材料题:材料(大意):小张是借调到某单位的年轻职工。他和该单位领导及该单位职工老赵一起去某县调研。该县是领导以前工作过的地方。在调研中小张发现该县存在很严重的问题,他对老赵说要向领导汇报,老赵建议小张谨慎点好。调研结束后还没等到向领导汇
所谓计算机系统的全部资源,它指的是
SecretsofStrongFamiliesAgroupofAmericanmarriageandfamilycounselorsonceplacedabriefnoticeinfourdozennewsp
最新回复
(
0
)