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
53
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.
【P9】
选项
A、
B、
C、
D、
答案
C
解析
由C中的how it works中的“This means you don’t need touse so much gas or electricity to heat your water at home.”可知答案为C。
转载请注明原文地址:https://kaotiyun.com/show/JVXd777K
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
Theworld’sfirstworkers’compensationlawwasintroducedbyBismarck______.OneoftheproblemstheAmericaninjuredworkers
Supermarketshoppershaveneverbeenmorespoiltforchoice.Butjustwhenwethoughttraditionalsystemsofselectivefarming
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.
TherecentsocialandeconomicchangesintheU.S.havegreatimpactonalltheAmericanhousingsystem.
PresidentBushintendstoprovideillegalimmigrantswithanopportunitytogetlegalresidencyorAmericancitizenship.
PresidentBushintendstoprovideillegalimmigrantswithanopportunitytogetlegalresidencyorAmericancitizenship.
PresidentBushintendstoprovideillegalimmigrantswithanopportunitytogetlegalresidencyorAmericancitizenship.
PresidentBushintendstoprovideillegalimmigrantswithanopportunitytogetlegalresidencyorAmericancitizenship.
WhatfoodisnotprovidedformostBritishchildrenatschool?
随机试题
A.淀粉B.淀粉浆C.羧甲基淀粉钠D.硬脂酸镁E.滑石粉伊曲康唑片处方中崩解剂
下列选项中,地表水治理措施不包括的是()。
某企业职工人数资料如下,则该企业3~6月份平均职工人数为( )。
下列有关普通合伙氽业合伙事务执行的表述中,符合《合伙企业法》规定的是()。
甲、乙订立承揽合同,甲提供木料,乙为其加工家具。在乙已完成加工工作的50%时,甲通知乙解除合同。根据合同法律制度的规定,下列表述中,正确的是()。
下列关于幼儿记忆年龄特征的表述不正确的是()。
家长工作管理的主要内容包括:家长委员会的管理、______的管理、个别家长的沟通与管理以及群体家长工作的管理。
注意事项1.本题本由给定资料与作答要求两部分构成,考试时限为150分钟,其中,阅读给定资料参考时限为40分钟,作答参考时限为110分钟。2.请在题本、答题卡指定位置上用黑色字迹的钢笔或签字笔填写自己的姓名和准考证号,并用2B铅
1794年7月27日,法国国民公会通过了逮捕罗伯斯比尔等人的决议,这在大革命史上称为______,从而结束了恐怖统治,是恢复和建立资本主义正常秩序的转折点。
任何一片水域,是否能保持生机,主要取决于它是否有能力保持一定量的溶解于其中的氧气。如果倒进水中的只是少量的污物,鱼类一般不会受到影响,水中的细菌仍能发挥作用,分解污物,因为该片水域能从空气和水中植物那里很快使氧气消耗得到恢复。以下哪项最可能是上述陈述
最新回复
(
0
)