Far from the land of Antarctica(南极洲), a huge ...

Far from the land of Antarctica (南极洲), 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 - l.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

高三英语阅读理解中等难度题查看答案及解析

Far from the land of Antarctica (南极洲), 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°C 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°C. 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 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°C.   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°C.

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

高三英语阅读理解困难题查看答案及解析

Far from the land of Antarctica(南极洲), 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

高三英语阅读理解中等难度题查看答案及解析

Far from the land of Antarctica(南极洲), 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?

2.Why can the Antarctic cod live at the freezing temperature?

3.What does the underlined word “it” in Paragraph 5 refer to?

4.What does “glycol-” in the underlined word “glycoprotein” in the last paragraph mean?

高三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? 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 molecules. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein, or AFGP.

49. 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 Antarctic.                  D. Protection of the Antarctic cod.

50. 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℃.

51. 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.

52. What does “glycol” in the underlined word “glycoprotein” in the last paragraph mean?

A. sugar                      B. ice                   C. blood                      D. molecule

高三英语阅读理解简单题查看答案及解析

Antarctica is known for being a vast land of ice and snow, a place too cold for most life. Despite this, the continent is slowly starting to turn warm. According to the Guardian, the Antarctic has registered a new high temperature for the first time on record, prompting fears of climate instability in the world's iciest place.

On Feb 9, Brazilian researchers at Seymour Island reported a temperature of 20.75℃ on the icy continent of Antarctica. It was almost a full degree higher than the previous re- cord of 19. 8℃ , taken on Signy Island in January 1982.

This record — breaking reading was taken at a monitoring station in the northern part of Antarctica. According to Brazilian soil scientist Carlos Schaefer, the temperature was documented during a 20-year-long research project. The focus of this project is to study the effect that climate change has on the permafrost(永久冻土) within the region. Permafrost is soil that stays frozen for at least two years. Although this is a first record high for Antarctica, Schaefer stressed that “We can't use this to anticipate climatic changes in the future. It's simply a signal that something different is happening in that area.”

But in fact, the last high temperature reading was in the 19℃range. These higher temperatures can cause ice and glaciers in Antarctic regions to melt. The Antarctic peninsula—the long finger of land that stretches towards Argentina—is most dramatically affected. Scientists saw glaciers that have retreated by more than 100 meters in Discovery Bay where the snow melted in little more than a week, leaving dark exposed rock. This melted ice leads to a rise in sea levels that can threaten the safety of coastal areas. It's believed to be behind an alarming decline of more than 50 percent in chinstrap penguin(帽带企鹅) colonies, which are dependent on sea ice.

Like American writer Ernest Hemingway once said, “The Earth is a fine place and worth fighting for.” We should do everything we can to help save our planet. Otherwise, it may become too hot for us to fix.

1.What did Brazilian researchers report on Feb 9?

A.Seymour Island is the warmest region in the Antarctic.

B.Antarctica hit a record high temperature of 20. 75℃.

C.The average temperature of Antarctica ranges from 19. 8°C to 20. 75℃.

D.Antarctica's new record temperature is a full degree higher than the previous decade.

2.What's the main purpose of the 20-year-long research project?

A.To predict possible climatic change in the future.

B.To monitor Antarctica's contributions to world climate change.

C.To explain why the permafrost may cause glaciers to melt.

D.To examine how the permafrost is influenced by climate change.

3.What does the underlined word “retreated” probably mean?

A.moved backward. B.increased in size.

C.covered a certain area. D.stretched in an opposite direction.

4.According to the text, the melted glacier may lead to　　　　　 .

A.the pollution of ocean water B.the release of various viruses

C.threats to penguin habitats D.disappearances of coastal cities

高三英语阅读理解中等难度题查看答案及解析

Antarctica holds 90% of the world’s ice, and most of its fresh water (70%) is in a frozen ________.

A. state                B. condition            C. situation            D. solution

高三英语单项填空中等难度题查看答案及解析

Wind , water, fire and ice-these powerful natural forces have shaped the land of America in the past. They are still changing it today.

The Colorado River slowly cut down through stone to make the Grand Canyon(大峡谷).

Long ago, ice sheets cut Yosemite Valley and the Great Lakes, and glaciers(冰川) are still on the move in Alaska.

Wind and rain storm hit the land from time to time. Fires sometimes burn down forests and destroy the homes of wild animals. This happened in Yellowstone Park in 1988.

Dead volcanic mountains such as Haleakala on Maui and Carter Lakein Oregon are beautiful to look at. But there are several active volcanoes in the US, especially along the Pacific Coast. There are also many earthquakes in this area. Scientists can do nothing to control earthquakes or volcanoes. This was shown clearly on May 18, 1980. At 8:32 that morning, Mount St Helens in Washington state broke out. The top of the mountain was blown off.

Over 60 people –campers, scientists, journalists, forest workers—were killed. Hundreds of square miles of forests were knocked down. In towns over 100 miles away, day suddenly became night. An ash cloud hid the sun for many hours. Towns and fields in Washington, Oregon, and Idaho were covered with dirty gray ash.

Scientists knew that Mt St Helens might erupt(爆发) soon. But no one could say when. And no one expected the terrible strength of the eruption. Many people were surprised and unready. Harry R. Truman, 84, owned a small hotel in Mt St Helens. Scientists had asked people to move away because the volcano was becoming dangerous.

But Harry Truman would not leave his home. Now it is covered with many feet of dirty ash. A small cross stands above the place where Harry probably died. Perhaps it is better that he did not see the destruction of Mt St Helens, the once beautiful lake, and the forests.

But slowly, life is returning to the dead area around the mountain. Grass and small plants are beginning to grow again. Deer and birds have been seen. The land will never be the same as it once was. Perhaps Mt St Helens will erupt again. But this is all part of nature’s pattern of change, and man has little power to control it.

1.Choose the best title for this passage.

2.After the eruption of volcano, what makes the sky turn dark?

3.The underlined word “it” means______.

4.We can infer from this article that ______.

高三英语阅读理解中等难度题查看答案及解析

In the frozen continent of Antarctica scientists fear an alien invasion — not from outer space, but carried in people’s pockets and bags.

Seeds and plants accidentally brought to Antarctica by tourists and scientists may introduce alien plant species which could threaten the survival of native plants in the finely balanced ecosystem.

“The people that were carrying the most had lots and lots of seeds. They really were real threats,” said Dana Bergstrom, from the Australian Antarctic Division.

“When we take things in through hitchhiking（搭车旅行） then we get species which are competitive. The plants and animals there are not necessarily competitive, so we’d start losing various precious biodiversity（生物多样性） on the (Antarctic) continent”, Bergstrom told Reuters.

Amongst the alien species discovered were the Iceland Poppy, and Annual Winter Grass — all from cold climates and capable of growing in Antarctica.

The Antarctic Peninsula, where most tourists travel, is now considered a “hot spot” on the frozen continent and the warmer the climate, the easier for seeds to grow. “The peninsula(半岛) is warming at some of the greatest rates on the planet,” said Bergstrom.

The study, the first continent-wide assessment of invasive species in Antarctica, surveyed about 1,000 passengers during 2007-2008, the first year of the International Polar Year, an international effort to research the polar areas.

Bergstrom said the one alien seed that had gained a foothold is Annual Winter Grass. It is a strong weed in the sub-Antarctic and is on the Antarctic island of King George. It has also made its way to the tail part of the Antarctic continent.

1.What does the passage focus on?

A. The human influence on the native plants.

B. The development of native plants.

C. The discovery of new plants.

D. The promising future of tourism.

2.What is the effect of alien plant seeds to Antarctica?

A. They contribute to the biodiversity.

B. They lead to the warming up of Antarctica.

C. They make the native plants more competitive.

D. They break the balance of the natural environment of plants.

3.What can we learn from the passage?

A. The International Polar Year started in 2007.

B. Visitors to Antarctica are mainly scientists.

C. Visitors to Antarctica bring seeds on purpose.

D. Tall Fescue Velvet grass grows well in warm places.

4.What is the purpose of writing the passage?

A. To introduce the native environment of Antarctica.

B. To warn people of the danger of alien plant seeds to Antarctica.

C. To explain the relationship between plants and climate.

D. To give visitors some tips on how to explore Antarctica.

高三英语阅读理解中等难度题查看答案及解析

—Mum, I climbed to get the Teddy Bear from the top of the shelf.

—My goodness! You _______ yourself. You ______ do that next time.

A. must have hurt; mustn’t         B. should have hurt; can’t

C. may have hurt; mustn’t          D. might have hurt; won’t be able to

高三英语单项填空困难题查看答案及解析