北京赛车PK10冠军大小计划当天计划表歡迎您的到來!

您所在的位置: 首頁 > 雅思 > 雅思閱讀

雅思閱讀——圖示題(八)

作者:

2015-07-31 新通教育

新通雅思高分素材庫出爐啦!眾所周知,雅思閱讀一直是中國考生的薄弱項,新通教育為幫助廣大雅思考生突破閱讀瓶頸,提高閱讀成績,特地精心整理了雅思閱讀高分分類素材庫。那快來雅思閱讀高分素材庫汲取營養吧!

 

Tidal Power
    Undersea turbines which produce electricity from the tides are set to become an important source of renewable energy for Britain. It is still too early to predict the extent of the impact they may have, but all the signs are that they will play a significant role in the future
 
A Operating on the same principle as wind turbines, the power in sea turbines comes from tidal currents which turn blades similar to ships’ propellers, but, unlike wind, the tides are predictable and the power input is constant. The technology raises the prospect of Britain becoming self-sufficient in renewable energy and drastically reducing its carbon dioxide emissions. If tide, wind and wave power are all developed, Britain would be able to close gas, coal and nuclear power plants and export renewable power to other parts of Europe. Unlike wind power, which Britain originally developed and then abandoned for 20 years allowing the Dutch to make it a major industry, undersea turbines could become a big export earner to island nations such as Japan and New Zealand.
 
B  Tidal sites have already been identified that will produce one sixth or more of the UK’s power - and at prices competitive with modern gas turbines and undercutting those of the already ailing nuclear industry. One site alone, the Pentland Firth, between Orkney and mainland Scotland, could produce 10% of the country’s electricity with banks of turbines under the sea, and another at Alderney in the Channel Islands three times the 1,200 megawatts of Britain’s largest and newest nuclear plant, Sizewell B, in Suffolk. Other sites identified include the Bristol Channel and the west coast of Scotland, particularly the channel between Campbeltown and Northern Ireland.
 
C Work on designs for the new turbine blades and sites are well advanced at the University of Southampton’s sustainable energy research group. The first station is expected to be installed off Lynmouth in Devon shortly to test the technology in a venture jointly funded by the department of Trade and Industry and the European Union. AbuBakr Bahaj, in charge of the Southampton research, said: The prospects for energy from tidal currents are far better than from wind because the flows of water are predictable and constant. The technology for dealing with the hostile saline environment under the sea has been developed in the North Sea oil industry and much is already known about turbine blade design, because of wind power and ship propellers. There are a few technical difficulties, but I believe in the next five to ten years we will be installing commercial marine turbine farms.’ Southampton has been awarded £215,000 over three years to develop the turbines and is working with Marine Current Turbines, a subsidiary of IT power, on the Lynmouth project. EU research has now identified l06 potential sites for tidal power, 80% round the coasts of Britain. The best sites are between islands or around heavily indented coasts where there are strong tidal currents.
 
D A marine turbine blade needs to be only one third of the size of a wind generator to produce three times as much power. The blades will be about 20 metres in diameter, so around 30 metres of water is required. Unlike wind power, there are unlikely to be environmental objections. Fish and other creatures are thought unlikely to be at risk from the relatively slow-turning blades. Each turbine will be mounted on a tower which will connect to the national power supply grid via underwater cables. The towers will stick out of the water and be lit, to warn shipping, and also be designed to be lifted out of the water for maintenance and to clean seaweed from the blades.
 
E Dr Bahaj has done most work on the Alderney site, where there are powerful currents. The single undersea turbine farm would produce far more power than needed for the Channel Islands and most would be fed into the French Grid and be re-imported into Britain via the cable under the Channel.
 
F One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles. These can cause vibration and damage the blades of the turbines. Dr Bahaj said: ‘We have to test a number of blade types to avoid this happening or at least make sure it does not damage the turbines or reduce performance. Another slight concern is submerged debris floating into the blades. So far we do not know how much of a problem it might be. We will have to make the turbines robust because the sea is a hostile environment,but all the signs that we can do it are good.’
 
 
Questions 23-26
Label the diagram below.
Choose NO MORE THAN TWO WORDS from the passage for each answer. Write your answers in boxes 23-26 on your answer sheet.
 
An Undersea Turbine
 
Whole tower can be raised
for 23                   and the extraction
of seaweed from the blades
Air bubbles result from
the 25                behind blades.
This is known as 26                          
 
Sea life not in danger due to the fact that blades are comparatively 24                 
 

查看正確答案和解析

雅思 保分課程

課程名稱 學習目標 班級特色
雅思5.5分鉆石小班 雅思5.5分 夯實基礎綜合提高 報名
雅思6.5分沖刺9人班 保6沖6.5分 名師課程超低價格 報名
雅思考前沖刺班 沖刺7分 短期集訓沖刺高分 報名
雅思基礎VIP1V1課程 個人定制 針對個人量身定制課程 報名
雅思VIP高端定制7分班 保6.5爭7分 小班保分通過 報名
雅思考前點題班(周末) 雅思6.5分 助教全程跟進服務升級 報名

更多分享

劍橋雅思真題系列免費打包下載
  • 劍橋雅思官方真題4-11合集

    免費下載

    格式: doc 大。20.0MB

    免費下載
  • 劍橋雅思聽力考試真題合集

    免費下載

    格式: doc 大。26.5MB

    免費下載
  • 劍橋雅思寫作高分范文合集

    免費下載

    格式: doc 大。612KB

    免費下載
語培留學服務
  • 考試提醒
  • 報名
  • 考試
  • 查分
2019年雅思考試報名時間

近期考試:1月5日 1月12日 1月17日 1月19日 1月26日

近期考試:1月5日 1月12日 1月17日 1月19日 1月26日

2019年雅思成績查詢入口

近期考試:1月5日 1月12日 1月17日 1月19日 1月26日

  • 考前預測
  • 名師押題 縮小范圍100%命中
北京赛车PK10冠军大小计划当天计划表 北京PK10全天两期计划 北京赛车PK10计划开奖号