Compared with solar and wind energy, which are booming, tidal (潮汐的) power is a loser in the clean-energy competition. But if you did want to build a tidal power station, there are few better sites than the mouth of the River Severn, in Britain. Its tidal range, the difference in depth between high and low tides, of around 15 metres is among the largest in the world.
Engineers and governments have been toying with the idea since at least 1925. But none of the suggested projects has materialised. Price is one objection. A study thought that tidal energy might cost between £216 and £368 ($306-521) per MWh of electricity by 2025, compared with £58-75 for seagoing wind turbines (轮机) and £55-76 for solar panels. Environmentalists also worry that any plant would change the tides, making life harder for wildlife.
An engineer called Rod Rainey thinks he has a way around both problems. He plans to replace the conventional turbines of previous plans with a much older technology. Specifically, he plans to span (横跨) the river mouth with a line of water wheels. This is a design that dates back to the early days of the Industrial Revolution. Examples can be found fixed to the sides of old watermills (水磨).
But there would be nothing old-fashioned about Mr Rainey’s wheels. Thirty metres high and sixty wide, they would be made from ordinary steel. Two hundred and fifty of them, along with the supporting structures, would be floated into place and secured to the seabed, creating a line 15km long. Together, they could supply power at an avenge ate of 4GW. That is about as much as two biggish nuclear power stations would manage. Substituting one of the wheels with a set of locks would provide a shipping channel about twice the width of Panama Canal, permitting upstream ports such as Avonmouth and Cardiff to continue operating.
1.What is special about the mouth of the River Seven?
A.The tidal range there is about 15 meters.
B.It has the largest tidal range in the world.
C.The tidal power station has been built there.
D.Its power plant makes life harder for wildlife.
2.What was people’s initial attitude towards tidal power?
A.Opposed. B.Supportive.
C.Controversial. D.Doubtful.
3.What are the locks used for?
A.Support. B.Transportation.
C.Securing wheels. D.Producing electricity.
4.What’s the best tittle for the text?
A.Rainey invented turbines.
B.Rainey’s tidal power station.
C.Tidal power in the River Seven.
D.An old idea might be made practical.
高三英语阅读理解困难题
Compared with solar and wind energy, which are booming, tidal (潮汐的) power is a loser in the clean-energy competition. But if you did want to build a tidal power station, there are few better sites than the mouth of the River Severn, in Britain. Its tidal range, the difference in depth between high and low tides, of around 15 metres is among the largest in the world.
Engineers and governments have been toying with the idea since at least 1925. But none of the suggested projects has materialised. Price is one objection. A study thought that tidal energy might cost between £216 and £368 ($306-521) per MWh of electricity by 2025, compared with £58-75 for seagoing wind turbines (轮机) and £55-76 for solar panels. Environmentalists also worry that any plant would change the tides, making life harder for wildlife.
An engineer called Rod Rainey thinks he has a way around both problems. He plans to replace the conventional turbines of previous plans with a much older technology. Specifically, he plans to span (横跨) the river mouth with a line of water wheels. This is a design that dates back to the early days of the Industrial Revolution. Examples can be found fixed to the sides of old watermills (水磨).
But there would be nothing old-fashioned about Mr Rainey’s wheels. Thirty metres high and sixty wide, they would be made from ordinary steel. Two hundred and fifty of them, along with the supporting structures, would be floated into place and secured to the seabed, creating a line 15km long. Together, they could supply power at an avenge ate of 4GW. That is about as much as two biggish nuclear power stations would manage. Substituting one of the wheels with a set of locks would provide a shipping channel about twice the width of Panama Canal, permitting upstream ports such as Avonmouth and Cardiff to continue operating.
1.What is special about the mouth of the River Seven?
A.The tidal range there is about 15 meters.
B.It has the largest tidal range in the world.
C.The tidal power station has been built there.
D.Its power plant makes life harder for wildlife.
2.What was people’s initial attitude towards tidal power?
A.Opposed. B.Supportive.
C.Controversial. D.Doubtful.
3.What are the locks used for?
A.Support. B.Transportation.
C.Securing wheels. D.Producing electricity.
4.What’s the best tittle for the text?
A.Rainey invented turbines.
B.Rainey’s tidal power station.
C.Tidal power in the River Seven.
D.An old idea might be made practical.
高三英语阅读理解困难题查看答案及解析
________, more than 200 houses and buildings are heated by solar energy, not to mention the big cities.
A. In the alone small town B. In the small town alone
C. Alone in the small town D. In the small alone town
高三英语单项填空中等难度题查看答案及解析
Most of the films are now released at multiplex cinemas, which have boomed in recent years, and ____ more than two-thirds of the ticket revenue generated by the movie industry.
A.on account of B.account for C.take account of D.by all accounts
高三英语单项填空困难题查看答案及解析
Many countries are increasing their use of natural gas, wind and other forms of ________ .
A. energy B. source C. power D. material
高三英语单项填空简单题查看答案及解析
Many countries are increasing their use of natural gas, wind and other forms of ____.
A. energy B. source C. power D. material
高三英语单项填空中等难度题查看答案及解析
Nowadays along with the booming of computer science, computers are widely used here and there. People even can find computers in most classrooms. While teachers remain more or less the same, computers are doubling in speed and capability every four years. 1. As far as I am concerned, teachers still play a major role and are still of great importance.
2. However advanced they may be, computers are nothing more than human inventions programmed to perform certain tasks.
They are unable to deal with students with different background. Needless to say, a classroom is a place where individual attention and creativity matter most. Therefore, computers are no better than other tools used by teachers and couldn’t possibly make the roles played by them weaker.
In terms of accuracy and the amount of information, computers outshine humans. 3. Indeed, a good teacher organizes and inspires the students.
Besides, the interaction between students and teachers is vital for the learning. According to most education authorities, real learning occurs during the discussion and sharing of ideas with one’s teacher and classmates. Moreover, a teacher is there to monitor every slight change in students’ attitude, to respond to and encourage them whenever they show signs of frustration and impatience. 4.
Despite the increasing presence of computers inside classrooms, teachers are just as essential, if not more so, as instructors were in the past. 5.
A. It’s time that teachers should develop themselves.
B. Without this kind of interaction, education is unimaginable.
C. Advanced as computers may be, some teachers are less impatient.
D. But to make a good teacher means far more than being an encyclopedia (百科全书).
E. People can’t help wondering whether teachers are as important as they once were.
F. Some drawbacks make it impossible for computers to replace teachers in classrooms.
G. It is well known that computers are better at repetitive work but incapable of creative thinking.
高三英语七选五简单题查看答案及解析
Wind power is an ancient source of energy we may return in the near future.
A. on which B. by which C. to which D. from which
高三英语单项填空简单题查看答案及解析
Wind power is an ancient source of energy _____ we may return in the near future.
A. to which B. by which C. from which D. on which
高三英语单项填空困难题查看答案及解析
Wind power is an ancient source of energy ________we may return in the near future.
A. on which B. by which C. to which D. from which
高三英语单项填空中等难度题查看答案及解析
Wind power is an ancient source of energy ________ we may return in the near future.
A. in which B. to which C. on that D. from which
高三英语单项填空中等难度题查看答案及解析