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Nuclear power is the world's largest source of clean energy. Nuclear power plants(电厂) produce no controlled air pollutants, such as sulfur or greenhouse gases. The use of nuclear power in place of other energy sources helps to keep the air clean, preserve the earth's climate, and prevent acid rain.
However, there exist safety concerns if the plant is not operated correctly or unforeseen things happened when the plant was developed, as happened at the Fukishima(福岛) plant in Japan. It may cause damage to everything, including our health. Nuclear power's danger to health, safety, and even life itself can be summed up in one word: radiation.
Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.
At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and if they are killed immediately. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years.
This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated(辐射)and feel fine, then die for cancer five, ten, or twenty years later as a result. Or a child can be born weak as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth.
1.What can we infer from the passage?
A. We can’t detect radioactivity even with modern equipment.
B. Only radiation at very high levels can kill an animal or human being.
C. If a few cells are only damaged, healthy cells will take the place of dead ones.
D. Radiation is harmful no matter what level it is.
2.How can nuclear radiation kill an animal?
A. By killing many cells in important organs.
B. By killing a few cells.
C. By hitting any place in its body.
D. By damaging its heart.
3.If a human being is hit by nuclear radiation, he may .
A. die of cancer after many years
B. die immediately
C. have a child who may be born weak
D. all of the above
4.What’s the author’s main purpose in writing this passage?
A. Discussing the cause of cancer.
B. Solving the mystery about radiation.
C. Emphasizing the importance of protection from radiation.
D. Introducing the nuclear power.
高二英语阅读理解中等难度题查看答案及解析
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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
高二英语单项填空中等难度题查看答案及解析
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Wind power is an ancient source of energy ________we may return in the near future.
A. on which B. to which C. by which D. from which
高二英语单项填空简单题查看答案及解析
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Alternative Sources of Energy
The world's number one energy source is not man-made. It is much bigger than anything that Man could ever dream of designing or manufacturing, and in fact produces all the energy needs of everybody on Earth.1.. Apart from it, other energy sources are being exploited by Man to facilitate the development of the modern civilization.
Solar Energy
Solar energy is a simple and already familiar source of more direct renewable energy production. Its use is on the increase as technology improves.2.. In India there are plans to power 100,000 villages and install 500,000 solar powered telephones. During the course of one year, Europe receives approximately 1000-kilowatt hours of solar energy each square meter.
Water Energy
Water power is used in countries that have a lot of natural rivers and streams.
3., because in order to generate hydroelectric power, engineers must first build a dam to block a river and create a reservoir. Power is generated as the water flow from reservoirs is directed to turn turbines and electric generators.
Wind Energy.
4.. Many countries have also traditionally used wind as a source of power by building windmills. Some windmills even have been used for more than a century, but there has been a significant increase since the 1970s. They are already a familiar sight in Netherlands, Denmark and on windy islands such as Las Palmas in the Canary Islands.
Of course there are many other alternative sources of energy (geothermal power, tidal power, etc.), which are currently being researched and used in countries around the world. These sources often create less pollution than traditional sources of power and are becoming more economical to use as technology improves.5..
A. Solar energy is said to keep down the costs of maintenance and energy.
B. It is happening in both developed countries and emerging economies like India.
C. The best source of energy is wind energy.
D. They are the logical choice towards a more environmentally conscious planet.
E. That energy source is by all means the Sun.
F. Another form of energy with us for centuries is the use of wind power.
G. Some environmentalists claim that this type of power can be hazardous to local ecosystems.
高二英语七选五困难题查看答案及解析
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Orcas, or killer whales, are the largest of the dolphins and one of the world’s most powerful animals feeding on meat. They feast on marine mammals such as seals, sea lions, and even whales, employing teeth that can be four inches (ten centimeters) long. They are known to grab seals right off the ice. They also eat fish, squid (鱿鱼), and seabirds.
Though they often frequent cold, coastal waters, orcas can be found from the polar regions to the Equator (赤道).
Killer whales hunt in deadly groups, family groups of up to 40 individuals. There appear to be both permanent and temporary group populations of killer whales. These different groups may hunt different animals and use different techniques to catch them. Permanent groups tend to prefer fish, while temporary groups target marine mammals. All groups use effective, cooperative hunting techniques that some are similar to the behavior of wolf packs.
Whales make a wide variety of communicative sounds, and each group has various noises that its members will recognize even at a distance. They use echolocation (回波定位) to communicate and hunt, making sounds that travel underwater until they meet objects, then reflect back, showing their location, size, and shape.
Killer whales are protective of their young, and other adolescent females often assist the mother in caring for them. Mothers give birth every three to ten years, after a 17-month pregnancy.
Killer whales are immediately recognizable by their special black-and-white coloring and are the intelligent, trainable stars of many aquarium shows. Killer whales have never been widely hunted by humans.
1. Killer Whales do not feed on ______.
A. seabirds B. seals C. fishes D. seaweeds
2.【The following aspects about killers whales are mentioned except ______.
A. hunting B. communication C. weight D. habitats
3.We can conclude that ______.
A. people can find killer whales everywhere around the world
B. killer whales live in different groups and never live alone
C. by making sounds killer whales hunt and communicate
D. humans’ hunt has made killer whales being endangered
4.Killer Whale are often seen in some aquarium shows because ______.
A. they are able to be trained
B. they have special body colors
C. they must be protected
D. they have never been hunted
高二英语阅读理解中等难度题查看答案及解析
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Welcome to the future. It’s year 2050 and Scotland is now powered completely by“clean”energy.
Homes have entire roofs made of solar materials, rooms are kept warm by wallpaper, and people go to and from work in electric and hydrogen( 氢) cars.
Oil is still being found in the North Sea, but it’s not now only used to keep aircraft flying. And a new 500---mile underwater link with Iceland has been built to catch heat from the hot springs. There’s still a role for king coal—but the black diamonds are now environment---friendly.
People will be able to import the electricity they need and export any excess(超过的量) they make through rooftop windmills(风车). New technology will store electricity better and provide it on demand. Heat exchangers will provide heating and hot water.
Harmful carbon dioxide waste is being piped offshore to St Fergus and from there into some of the remaining oil—producing fields to be stored safely without entering the atmosphere. Gas remains the preferred energy source of industry and is now shipped in liquid form. But hydrogen is imported through pipelines from France and from a geothermal (地热的) plant in Iceland.
Hydrogen—fuelled cars have become popular. Electric bikes are common in cities using the new urban two—wheel network. Electric vehicles have become common, and their performances have been improved because of the developments in electrical drive technology like high—temperature super conducting motors. Many people leave their vehicles in a giant park where they can be recharged from the national electrical system . Oilseed rape (油菜) is widely grown to fuel some motors .
1.What does the underlined phrase in paragraph 2 mean ?
A. The hot springs B. Oil C. Coal D. Oil and coal
2.Which sources of energy play a more important role in people’s daily life in the future ?
A. Oil and coal
B. Hydrogen and gas
C. Electricity and gas
D. Solar energy and wind
3.The means of transport people use in 2050 do not include__________.
A. windmills B. electric bikes C. hydrogen—fuelled cars D. aircraft
4.The passage is written to tell us in the future_____________.
A. life will be better and better
B. the energy will become cleaner and cleaner
C. people will use some new sources of energy
D. people will pay more attention to the environment
高二英语阅读理解中等难度题查看答案及解析
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Welcome to the future. It’s year 2050 and Scotland is now powered completely by“clean”energy.
Homes have entire roofs made of solar materials, rooms are kept warm by wallpaper, and people go to and from work in electric and hydrogen( 氢) cars.
Oil is still being found in the North Sea, but it’s not now only used to keep aircraft flying. And a new 500---mile underwater link with Iceland has been built to catch heat from the hot springs. There’s still a role for king coal—but the black diamonds are now environment---friendly.
People will be able to import the electricity they need and export any excess(超过的量) they make through rooftop windmills(风车). New technology will store electricity better and provide it on demand. Heat exchangers will provide heating and hot water.
Harmful carbon dioxide waste is being piped offshore to St Fergus and from there into some of the remaining oil—producing fields to be stored safely without entering the atmosphere. Gas remains the preferred energy source of industry and is now shipped in liquid form. But hydrogen is imported through pipelines from France and from a geothermal (地热的) plant in Iceland.
Hydrogen—fuelled cars have become popular
. Electric bikes are common in cities using the new urban two—wheel network. Electric vehicles have become common, and their performances have been improved because of the developments in electrical drive technology like high—temperature super conducting motors. Many people leave their vehicles in a giant park where they can be recharged from the national electrical system . Oilseed rape (油菜) is widely grown to fuel some motors .1.What does the underlined phrase in paragraph 2 mean ?
A. The hot springs B. Oil
C. Coal D. Oil and coal
2.Which sources of energy play a more important role in people’s daily life in the future ?
A. Oil and coal
B. Hydrogen and gas
C. Electricity and gas
D. Solar energy and wind
3.The means of transport people use in 2050 do not include__________.
A. windmills B. electric bikes
C. hydrogen—fuelled cars D. aircraft
4.The passage is written to tell us in the future_____________.
A. life will be better and better
B. the energy will become cleaner and cleaner
C. people will use some new sources of energy
D. people will pay more attention to the environment
高二英语阅读理解简单题查看答案及解析
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Melbourne,with a population of over 3.5 million,is the second largest city in Austria.It is clean,dynamic and exciting,and well-known internationally for its universities and other educational institutions.The city has well-planned tree-lined wide streets and many beautiful parks and gardens.It has a good transport system of roads, buses,trains and trams.The La Trobe University campus is connected to the Central Business District by trams, express buses,and bus and train connections.Melbourne is a culturally rich city,and is home to large communities of people from all parts of Europe,America,Africa and Asia.The city is famous for its restaurants, theatres, music, opera, ballet,art,culture and shops,and a lively and dynamic nightlife.Melbourne people are enthusiastic about sports, and the city hosts many famous international sports events,Near Melbourne there are beautiful coastlines with excellent beaches,national parks,forests,wineries,winter snowfields and summer resorts.The climate is temperate and comfortable,with warm summers and cool winters.In summer,maximum daytime temperatures range from 26℃ to 36℃,and in winter from 12℃ to 18℃.The weather in Melbourne can be variable from day to day.Melbourne was rated the world’s best city to live in by the Economist Intelligence Unit.
1.Melbourne is well-known in the world for its .
A. large population B. educational institutions
C. transport system D. beautiful parks and gardens
2.According to passage,Melbourne is the city where .
A. rich people choose to live B. the best wine is produced
C. various cultures exist D. Asian food is popular
3.The best title for the passage might be .
A. In Ideal Place for Shopping B. A City with the Best Climate
C. The World’s Best City to Live in D. The world’s Most Beautiful City
高二英语阅读理解中等难度题查看答案及解析
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根据首字母或汉语提示，在空白处填入适当的单词或括号内单词的正确形式。
1.The Internet is the biggest source of information in the world, which is ________ (access) through a computer.
2.According to the relevant documents, several import duty will be ________ (lay) off.
3.When what a scientist does is not working, a scientist sets aside all of the ________ (assume) and starts over.
4.The police were a bit ________ (suspect) of the package that was left in the corridor.
5.If people had got the warning earlier, they wouldn’t ________ (panic) at the sudden attack of epidemics.
6.There are very few sites that would appeal to you the i________ you lay your eyes on them.
7.Most employees enjoy the ________ (flexible) of their working arrangement.
8.Many candidates will come across the question: why do you think you are q________ (合格)?
9.Measure should be taken to preserve those a________ (原作的) works of art from ancient times.
10.Practice is the only c ________ (评判标准) of truth and the standard of practice should be first and fundamental in the theory of knowledge.
11.She asked for her parents’ ________ (approve) before going out with her boy friend.
12.As we all know, English people are a________ (习惯于) to using weather as a subject of starting a conversation.
13.He made a________ (保守的) guess at the employment rate this year.
14.USTC is one of the country’s most d________ (杰出的) universities producing numerous outstanding students.
15.His teacher suggested that he c________ (请教) more experts for further evidence.
高二英语单词拼写中等难度题查看答案及解析
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IKEA is the world’s largest furniture retailer, and the man behind it is Ingvar Kamprad, one of the world’s most successful enterprisers. Born in Sweden in 1926, Kamprad was a natural businessman. As a child, he enjoyed selling things and made small profits from selling matches, seeds, and pencils in his community. When Kamprad was 17, his father gave him some money as a reward for his good grades. Naturally he used it to start up a business—IKEA.
IKEA’s name comes from Kamprad’s initials (I.K.) and the place where he grew up (‘E’ and ‘A’). Today IKEA is known for its modern, minimalist furniture, but it was not a furniture company in the beginning. Rather, IKEA sold all kinds of miscellaneous goods.
Kamprad’s goods included anything that he could sell for profits at discounted prices, including watches, pens and stockings.
IKEA first began to sell furniture through a mail-order catalogue in 1947. The furniture was all designed and made by manufacturers near Kamprad’s home. Initial sales were very encouraging, so Kamprad expanded the product line．Furniture was such a successful aspect of the business that IKEA became solely a furniture company in 1951.
In 1953 IKEA opened its first showroom in Almhult, Sweden. IKEA is known today for its large stores with furniture in attractive settings, but in the early1950s, people ordered from catalogues. Thus response to the first showroom was overwhelming: people loved being able to see and try the furniture before buying it. This led to increased sales and the company continued to develop. By 1955, IKEA was designing all its own furniture.
In 1956 Kamprad saw a man disassembling(拆卸) a table to make it easier to transport. Kamprad was inspired. The man had given him a great idea: flat packaging. Flat packaging would mean lower shipping costs for IKEA and lower prices for customers. IKEA tried it and sales went up. The problem was that people had to assemble furniture themselves, but over time, even this grew into an advantage for IKEA. Nowadays, IKEA is often seen as having connotations(内涵) of self-sufficiency. This image has done wonders for the company, leading to better sales and continued expansion．
Today there are over 200 stores in 32 countries. Amazingly, Ingvar Kamprad has managed to keep IKEA a privately-held company. In 2004 he was named the world’s richest man. He currently lives in Switzerland and is retired from the day-to-day operations of IKEA. IKEA itself, though, just keeps on growing.
1.The author states in Paragraph 6 that flat packaging___________.
A. needs large space to assembly furniture
B. is a business concept inspired by Kamprad
C. helps reduce transportation costs
D. makes the company self-sufficient
2.What is the main idea of the passage?
A. Ingvar Kamprad is the richest man in the world.
B. IKEA is the world’s largest furniture retailer.
C. The advantage of IKEA’s furniture is dissembling.
D. Ingvar Kamprad established IKEA and led it to great success.
3.What is the author’s attitude towards IKEA’s future according to the last paragraph?
A. Indifferent B. Optimistic
C. Doubtful D. Pessimistic
高二英语阅读理解困难题查看答案及解析
. Electric bikes are common in cities using the new urban two—wheel network. Electric vehicles have become common, and their performances have been improved because of the developments in electrical drive technology like high—temperature super conducting motors. Many people leave their vehicles in a giant park where they can be recharged from the national electrical system . Oilseed rape (油菜) is widely grown to fuel some motors .