Far from the land of Antarctica, a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.
For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? There must be some secrets. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.
Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish's blood and measured its freezing point.
The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.
The scientists' next research job was clear: find out what in the fish's blood kept it from freezing. Their search led to some really strange things made up of a protein(蛋白质) never seen in the blood of a fish before. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.
Study showed that it is an unusual kind of protein. It has many small sugar molecules(分子) held in special positions within each big protein molecule. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein, or AFGP.
1. What is the text mainly about?
A. The terrible conditions in the Antarctic. B. A special fish living in freezing waters.
C. The ice shelf around Antarctica. D. Protection of the Antarctic cod.
2. Why can the Antarctic cod live at the freezing temperature?
A. The seawater has a temperature of -1.88℃.
B. It loves to live in the ice-salt mixture.
C. A special protein keeps it from freezing.
D. Its blood has a temperature lower than -2.05℃.
3. What does "glycol-" in the underlined word "glycoprotein" in the last paragraph mean?
A. sugar B. ice C. blood D. molecule
高二英语阅读理解中等难度题
Far from the land of Antarctica, a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.
For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? It must have some secret. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.
Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish’s blood and measured its freezing point.
The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.
The scientists’ next research job was clear: Find out what in the fish’s blood kept it from freezing. Their search led to some really strange thing made up of a protein never before seen in the blood of a fish. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.
Study showed that it is an unusual kind of protein. It has many small sugar molecules held in special positions within each big protein molecule. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein. Or AFGP.
1.What is the text mainly about?
A. The terrible conditions in the Antarctic.
B. A special fish living in freezing waters.
C. The ice shelf around Antarctica.
D. Protection of the Antarctic cod.
2.Why can the Antarctic cod live at the freezing temperature?
A. The seawater has a temperature of -1.88℃.
B. It loves to live in the ice-salt mixture.
C. A special protein keeps it from freezing.
D. Its blood has a temperature lower than -2.05℃.
3. What does the underlined word “it” in Paragraph 5 refer to?
A. A type of ice-salt mixture. B. A newly found protein.
C. Fish blood. D. Sugar molecule.
4.What does “glyco-” in the underlined word “glycoprotein” in the last paragraph mean?
A. sugar B. ice
C. blood D. molecule
高二英语阅读理解中等难度题查看答案及解析
Far from the land of Antarctica, a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.
For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? It must have some secret. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.
Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish’s blood and measured its freezing point.
The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.
The scientists’ next research job was clear: Find out what in the fish’s blood kept it from freezing. Their search led to some really strange thing made up of a protein(蛋白质) never before seen in the blood of a fish. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.
Study showed that it is an unusual kind of protein. It has many small sugar molecules(分子) held in special positions within each big protein molecule. Because of its sugar content. It is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein. Or AFGP.
1.
What is the text mainly about?
A. The terrible conditions in the Antarctic. B. A special fish living in freezing waters.
C. The ice shelf around Antarctica. D. Protection of the Antarctic cod.
2.
Why can the Antarctic cod live at the freezing temperature?
A. The seawater has a temperature of -1.88℃.
B. It loves to live in the ice-salt mixture.
C. A special protein keeps it from freezing.
D. Its blood has a temperature lower than -2.05℃.
3.
What does the underlined word “it” in Paragraph 5 refer to?
A. A type of ice-salt mixture. B. A newly found protein.
C. Fish blood. D. Sugar molecule.
4.
What does “glycol-” in the underlined word “glycoprotein” in the last paragraph mean?
A. sugar B. ice C. blood D. molecule
高二英语阅读理解简单题查看答案及解析
Far from the land of Antarctica, a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.
For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? There must be some secrets. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.
Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish's blood and measured its freezing point.
The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.
The scientists' next research job was clear: find out what in the fish's blood kept it from freezing. Their search led to some really strange things made up of a protein(蛋白质) never seen in the blood of a fish before. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.
Study showed that it is an unusual kind of protein. It has many small sugar molecules(分子) held in special positions within each big protein molecule. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein, or AFGP.
1. What is the text mainly about?
A. The terrible conditions in the Antarctic. B. A special fish living in freezing waters.
C. The ice shelf around Antarctica. D. Protection of the Antarctic cod.
2. Why can the Antarctic cod live at the freezing temperature?
A. The seawater has a temperature of -1.88℃.
B. It loves to live in the ice-salt mixture.
C. A special protein keeps it from freezing.
D. Its blood has a temperature lower than -2.05℃.
3. What does "glycol-" in the underlined word "glycoprotein" in the last paragraph mean?
A. sugar B. ice C. blood D. molecule
高二英语阅读理解中等难度题查看答案及解析
Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.
A. confirmed B. has confirmed
C. is confirmed D. has been confirmed
高二英语单项填空困难题查看答案及解析
根据首字母或提示词,结合句意写出所缺单词及其适当形式
1.Antarctica holds 90% of the world’s ice, and most of its fresh water is in a frozen s______, of course.
2.What western civilization gained from Gutenberg’s contribution is impossible to c______.
3.He hesitated for a second before shooting the ball, otherwise he could ______ (score) 3 points.
4.To my delight, I ______ (promote) to senior manager to attend the opening ceremony the other day.
5.We have already bought the house but we won’t take ______ (possess) of it until May.
6.Although the car is ______(basic) sound, I am worried about certain parts.
7.Police caught up with one gang the other day. but the three chief members f______accidentally.
8.Secondly, people were bored with the pop music of the day—disco music were both in d______ in the mid-1970s.
9.Many people suffered from the effects of poor nutrition and even starvation because of a lack of food, yet their welfare was of no c______ to the taxpayers of London.
10.The German team d______ to win the championship—they performed much better than any of the other teams.
高二英语单词拼写中等难度题查看答案及解析
Around the world, there are about 7,000 National Parks. Most of them cover huge areas of land where nobody lives. However, the National Parks in England include places where people live and work, as well as wild areas where there are few human activities.
The National Parks in England are called “England’s Breathing Spaces” because they are places where people can go to be in the open air, away from the dirt and noise of cities. They provide wonderful scenes of mountains, woods, grasslands and wetlands. And there are plenty of activities to do in all of the National Parks in England. Visitors can walk or ride bikes for fun. Many of the parks put on activities for families.
Every year there are about 110 million visitors to the parks, bringing many benefits(益处)to the areas. At the same time, it creates problems too. First, life can be difficult for local people. Car parks and roads are too crowded. Gift shops and cafes take the place of many everyday shops. Even house prices in some areas can become too high. Besides, country roads can be damaged, for too many people walk, cycle or ride horses on them. Roads can be rebuilt, but then they look less natural. Another big problem to the National Parks is litter. In the parks it is a danger to wild animals. Broken glass can also cause fires by focusing the rays of the sun. Such fires in wild places can be out of control.
? All National Parks in England are making more rules, which tell people how to take good care of their environment. If these rules are followed, the National Parks will be well kept and continue to give pleasure to many people for a very long time.
1.Visitors to the National Parks in England can .
A.give food to wild animals B.drive cars on the grasslands
C.enjoy fresh air and peaceful time D.have fun farming with local people
2.The third paragraph mainly tells us .
A.the problems of the National Parks B.the pollution caused by visitors
C.the development of the National Parks D.the benefits brought by visitors
3.Which of the following is the best sentence to fill the blank in Paragraph 4?
A.What can people get B.How can people help
C.What are the National Parks like D.How are the National Parks set up
4.The passage is probably taken from the part of a magazine.
A.transport B.wildlife
C.history D.geography
高二英语阅读理解中等难度题查看答案及解析
There’s something rotten in Rio and the smell is coming from the huge stacks of rubbish piled up on sidewalks all over the city. Rio's street sweepers chose the carnival holiday to demand better salaries. Their wages start at roughly $400 a month.
There could hardly be a better time for them to prove their importance. The streets were left a mess after hundreds of carnival parades and now, rubbish pries up in both poor and uptown neighborhoods and in tourist areas like Ipanema or Copacabana beach.
The president of Rio's rubbish collecting company has even appealed to the population to store rubbish at home whenever possible. He says 30% of the city's sweepers have gone on strike. Some of those who have been working have been threatened by the strike movement so now the police have been deployed alongside rubbish collectors to keep them sage as they go about their business.
The strike has divided opinions in Rio. On social media, many support the sweepers' demands for better salaries. Others say they are opportunists and the situation is a big embarrassment to the city.
But Brazil's culture of littering the streets doesn't help. A video that went viral online shows that even authorities have a problem with that. Rio's mayor, Eduardo Paes, is seen throwing what seemed to be the rest of an apple on the sidewalk—and now promised to impose himself a fine for his wrongdoing. His government recently created a programme to keep Rio's residents from littering the streets.
1.Rio's street cleaners go on strike to ________.
A. prove their importance B. ask for higher salaries
C. appeal to the public not to litter D. threaten the government
2.The reason why the police are involved is that ________.
A. the police are called out to put down the strike
B. the police are called up to collect rubbish for the time being
C. the police are required to protect some cleaners
D. the police are sent to arrest people who litter around
3.The author's attitude to Brazil's culture of littering is ________.
A. critical B. objective
C. supportive D. optimistic
4.The purpose of writing the passage is to ________.
A. criticize street sweepers of Rio for misusing their rights
B. call attention to the embarrassing situation of Rio
C. describe the effect or the strike on people
D. inform people of the present situation of Rio
高二英语阅读理解中等难度题查看答案及解析
With more forests being destroyed, huge quantities of good land ______ each year.
A. is washing away B. are washing away
C. is being washed away D. are being washed away
高二英语单项填空中等难度题查看答案及解析
With more forests being destroyed in that area, huge quantities of land _______ deserts each year.
A.has been turned into B.had been turned into
C.is being turned into D.are being turned into
高二英语单项填空中等难度题查看答案及解析
As we all know, the Internet will let people have ____________to huge amounts of information from their own homes.
A.entrance | B.way | C.means | D.access |
高二英语单项填空中等难度题查看答案及解析