How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there's evidence they may follow their noses. Sharks rely on their sense of smell to help chart a path through the ever-shifting waters of the deep seas, according to a new study. Scientists have supposed that the animals navigate by monitoring smell clues or the Earth's magnetic field, but no one knew for sure.
In new experiments near San Diego, scientists ferried wild leopard sharks about 6 miles(10 kilometers)away from their preferred habitats, fitted them with tracking devices, and stuffed some of the animals' noses with cotton balls. Just 30 minutes after being released facing the wrong way, sharks with full use of their smells made a corrective U-turn and then headed straight back to shore, "says study leader Andrew Nosal, a researcher at the Scripps Institution of Oceanography, California. Sharks with stuffed noses, meanwhile, "appeared lost, "wandering aimlessly and
swimming more slowly than those that could smell freely.
To test sharks' sense of direction, Nosal and colleagues captured several dozen leopard sharks, a small species found along the coast from Washington State to northern Mexico.
After blocking some of the animals' noses, the scientists then took the animals on a cruise to deeper waters before slipping them, safe and unharmed, back into the sea. Even the sharks with plugged noses made it partway back to shore before their tracking devices fell off. But those with unplugged noses "took very straight paths" toward home. Nosal supposes the sharks likely sniffed out chemical molecules found in higher and higher doses nearer to land.
Other scientists, however, remain unconvinced. Maybe the animals with plugged noses "were confused by the fact that they had something stuffed in their nose," says Kim Holland, a marine biologist at the University of Hawaii at Manoa. It's also unlikely the animals were following a smell that grew stronger closer to land, adds Jayne Gardiner, a sensory biologist at the New College of Florida. Animals that couldn't smell a thing still turned toward the beach, which "suggests something else is really guiding them," she says.
Study leader Nosal responds that sharks with cotton-stuffed nose willingly eat, suggesting that a congested nose doesn't upset them much. He agrees that sharks use a variety of markers to find their way, "but the point is that smell participates in navigation, "he says. "Our study was only the first step in solving this mystery. "
1.This passage is mainly about ________.
A.why sharks have a good sense of smell B.why sharks are clever animals
C.how scientists do the experiment D.how sharks find their way in the vast ocean
2.Which is true about the experiments done by the scientists according to the passage?
A.Scientists plugged sharks' noses to test whether they navigate through their sense of smell.
B.Scientists chose sharks' preferred habitats in order to track the animals easily.
C.After being taken to deeper waters, sharks with plugged noses couldn't make it to the shore.
D.The sharks in the experiments aren't willing to eat due to the plugged noses.
3.We can infer from the passage that________.
A.there are various markers for sharks to find their way and eyes play an important role in it
B.some scientists hold different opinions from the findings of the new study
C.the new study has completely solved the mystery of sharks' easy navigation in the vast ocean
D.the sharks likely sniffed out chemical molecules found in higher doses nearer to land
4.What's the purpose of writing this passage?
A.To call on people to protect the sharks.
B.To present different theories on the mystery of the sharks.
C.To let people learn more about the sharks.
D.To inform the readers of the findings of a new study on shark.
高一英语阅读理解困难题
How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there's evidence they may follow their noses. Sharks rely on their sense of smell to help chart a path through the ever-shifting waters of the deep seas, according to a new study. Scientists have supposed that the animals navigate by monitoring smell clues or the Earth's magnetic field, but no one knew for sure.
In new experiments near San Diego, scientists ferried wild leopard sharks about 6 miles(10 kilometers)away from their preferred habitats, fitted them with tracking devices, and stuffed some of the animals' noses with cotton balls. Just 30 minutes after being released facing the wrong way, sharks with full use of their smells made a corrective U-turn and then headed straight back to shore, "says study leader Andrew Nosal, a researcher at the Scripps Institution of Oceanography, California. Sharks with stuffed noses, meanwhile, "appeared lost, "wandering aimlessly and
swimming more slowly than those that could smell freely.
To test sharks' sense of direction, Nosal and colleagues captured several dozen leopard sharks, a small species found along the coast from Washington State to northern Mexico.
After blocking some of the animals' noses, the scientists then took the animals on a cruise to deeper waters before slipping them, safe and unharmed, back into the sea. Even the sharks with plugged noses made it partway back to shore before their tracking devices fell off. But those with unplugged noses "took very straight paths" toward home. Nosal supposes the sharks likely sniffed out chemical molecules found in higher and higher doses nearer to land.
Other scientists, however, remain unconvinced. Maybe the animals with plugged noses "were confused by the fact that they had something stuffed in their nose," says Kim Holland, a marine biologist at the University of Hawaii at Manoa. It's also unlikely the animals were following a smell that grew stronger closer to land, adds Jayne Gardiner, a sensory biologist at the New College of Florida. Animals that couldn't smell a thing still turned toward the beach, which "suggests something else is really guiding them," she says.
Study leader Nosal responds that sharks with cotton-stuffed nose willingly eat, suggesting that a congested nose doesn't upset them much. He agrees that sharks use a variety of markers to find their way, "but the point is that smell participates in navigation, "he says. "Our study was only the first step in solving this mystery. "
1.This passage is mainly about ________.
A.why sharks have a good sense of smell B.why sharks are clever animals
C.how scientists do the experiment D.how sharks find their way in the vast ocean
2.Which is true about the experiments done by the scientists according to the passage?
A.Scientists plugged sharks' noses to test whether they navigate through their sense of smell.
B.Scientists chose sharks' preferred habitats in order to track the animals easily.
C.After being taken to deeper waters, sharks with plugged noses couldn't make it to the shore.
D.The sharks in the experiments aren't willing to eat due to the plugged noses.
3.We can infer from the passage that________.
A.there are various markers for sharks to find their way and eyes play an important role in it
B.some scientists hold different opinions from the findings of the new study
C.the new study has completely solved the mystery of sharks' easy navigation in the vast ocean
D.the sharks likely sniffed out chemical molecules found in higher doses nearer to land
4.What's the purpose of writing this passage?
A.To call on people to protect the sharks.
B.To present different theories on the mystery of the sharks.
C.To let people learn more about the sharks.
D.To inform the readers of the findings of a new study on shark.
高一英语阅读理解困难题查看答案及解析
Sharks have lived in the world's oceans for millions of years. A shark has an extremely good sense of smell. It can find small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. These powerful senses help them find their food. 1.
Sharks grow slowly. About forty percent of the different kinds of sharks lay eggs. 2. Some sharks carry their young inside their bodies as humans do. Some sharks are not able to reproduce until they are twenty years old. Most reproduce only every two years. And they give birth to fewer than ten young sharks. For this reason, over-fishing of sharks is of special danger to the future of the animal.
3. .They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in the ocean do not become too great. This protects the plants and other forms of life that exist in the oceans.
People hunt sharks for sport, food, medicine and their skin. Experts say the international market for some kinds of sharks has increased greatly because many parts of a shark are valuable. 4. . Shark liver oil is a popular source of Vitamin. The skin of a shark can be used like leather. In Asia, people enjoy a kind of soup made from shark fins. Experts say a fisherman can earn a lot of money for even one kilogram of shark fins.
Sharks are among the oldest animals on Earth. 5. If too many sharks in one area are killed, the group of shark may never return to normal population levels
A. The others give birth to live young.
B. Sharks are important for the health of the world's oceans.
C. This is a threat to other form of life in the ocean.
D. Collectors pay thousands of dollars for the jaws of a shark.
E. Sharks are valuable to us and we can make full use of them.
F. But some sharks are in danger of disappearing from Earth.
G. Sharks eat fish, other sharks, and plants that live in the ocean
高一英语七选五中等难度题查看答案及解析
Sharks have been swimming in the ocean for millions of years. They were on Earth even before dinosaurs! At the top of the world’s ocean’s food chain, sharks help keep the population of other ocean animals in balance. A large drop in the number of sharks can cause serious problems for all ocean animals. Saving sharks makes sense!
Many people are afraid of sharks. But most sharks are harmless. Only a small percentage of sharks are known to attack humans. It adapt(适应) well to new habitats and eat whatever is available. However, today, sharks are in trouble. Nearly one-third of the 400 shark species are in danger of extinction, largely due to over-fishing. Each year, tens of millions of sharks are caught and killed just for their fins(鳍). The fins are used to make shark fin soup.
Humane Society International (HSI) joined with the Jane Goodall Institute’s Roots and Shoots program and Beijing Zoo to protect sharks. An exhibit at the zoo, “the Price Behind the Taste-----Protect Sharks. Don’t Eat Shark Fins”, was designed to tell people that shark finning is cruel and unnecessary. It’s hoped that the activity will help put an end to the practice.
Shark fin soup is also eaten in the United States. In fact, the numbers of some shark species in US waters have dropped 90 percent in the last 30 years. To slow the fall, laws against the sale of shark fins have been passed in several states, including Hawaii, Oregon, Washington, and California.
1.What does the first paragraph mainly tell us?
A. Ocean animals are at the top of the food chain.
B. Sharks play an important role in the ocean
C. Sharks are an old species in the ocean.
D. Sharks are being caught and killed.
2.According to paragraph 2, sharks are in trouble because ______.
A. they often attack humans.
B. their food is being polluted.
C. they are being caught for food.
D. their habitat is being destroyed.
3.The underlined part “the practice” in Paragraph 3 refers to _______.
A. shark finning B. shark protection
C. the program of HIS D. the exhibit at Beijing Zoo
4.What do we know from the text?
A. There are 400 shark species in the United States.
B. It’s illegal to eat shark fin soup in the United States.
C. Most sharks are not interested in a human for dinner.
D. Sharks are very particular about their habitats and food
高一英语阅读理解中等难度题查看答案及解析
_______ with the size of the whole earth, the biggest ocean does not seem big at all.
A. Compare B. Comparing C. To compare D. Compared
高一英语单项填空简单题查看答案及解析
___________ with the size of the whole earth, the biggest ocean does not seem big at all.
A．Compare B．Comparing C．When compared D．When comparing
高一英语单项填空简单题查看答案及解析
India has a very vast history and heritage（遗产）. The country has witnessed some of the most important events in the past and every event has an effect of its own on the culture, religion, lifestyle, and economy of the country. This is one of the leading reasons why tourists prefer India to travel and explore. Historical tours in India provide everything that a traveler expects from his/her journey. These historical tours give an opportunity to study and explore Indian history.
Historical tours of India generally consisted of four phases: ancient, medieval（中世纪的）, modern India and contemporary（当代的）India. Some of the historical travel packages are:
Forts and Palaces
The rich cultural past of India is reflected in the countless（无数的）forts and palaces across the country. Most of the forts were constructed as a defense device to keep the enemy away and palaces were made on the names of the kings and queens. Some of the famous forts and palaces are: Agra Fort (Agra), Fatehpur Sikri (Agra), Hawa Mahal (Jaipur), Amber Fort (Jaipur), City Palace (Jaipur), Gwalior Fort (Gwalior), Mysore Palace (Mysore), Red Fort (Delhi), etc.
India Heritage Tours
The main purpose of India Heritage tours is to make Indians as well as tourists familiar with the rich Indian legacy（遗产）. The heritage of the country is at least 5000 years. Some of the heritage tours are: medieval heritage, Rajput heritage, Golden Triangle, splendid Gujarat, etc.
South India Historical Tours
The Southern India is known for its diversity and there are many places, which attract tourists, not only from the country but also from all around the world. The famous tourists’ destinations（景区）in South India include Goa, Cochin, Kerala, Munnar, Periyar, Kottayam and the list goes on and on.
1.The main purpose of this passage is .
A．to report some important events in the history of India
B．to help study the culture and history of India
C．to tell us how to explore the history of India
D．to introduce some tours that can explore the history of India．
2.Many tourists prefer to travel to and explore because .
A．its culture is greatly influenced by its history
B．modern India has little to study
C．Indian people have an interesting lifestyle
D．India’s history is longer than that of any other country
3.Most forts were built in order to .
A．honor the kings B．keep enemies away
C．act as a palace for queens D．attract tourists
4.According to the passage, Rajput heritage .
A．is a famous fort in India
B．has a history of no more than 200 years
C．lies in South India
D．is one of the heritages in India
高一英语阅读理解中等难度题查看答案及解析
India has a very vast history and heritage(遗产). The country has witnessed some of the most important events in the past and every event has an effect of its own on the culture, religion, lifestyle, and economy of the country. This is one of the leading reasons why tourists prefer India to travel and explore. Historical tours in India provide everything that a traveler expects from his/her journey. These historical tours give an opportunity to study and explore Indian history.
Historical tours of India generally consisted of four phases: ancient, medieval(中世纪的), modern India and contemporary（当代的）India. Some of the historical travel packages are:
Forts and Palaces
The rich cultural past of India is reflected in the countless(无数的) forts and palaces across the country. Most of the forts were constructed as a defense device to keep the enemy away and palaces were made on the names of the kings and queens. Some of the famous forts and palaces are: Agra Fort (Agra), Fatehpur Sikri (Agra), Hawa Mahal (Jaipur), Amber Fort (Jaipur), City Palace (Jaipur), Gwalior Fort (Gwalior), Mysore Palace (Mysore), Red Fort (Delhi), etc.
India Heritage Tours
The main purpose of India Heritage tours is to make Indians as well as tourists familiar with the rich Indian legacy(遗产). The heritage of the country is at least 5000 years. Some of the heritage tours are: medieval heritage, Rajput heritage, Golden Triangle, splendid Gujarat, etc.
South India Historical Tours
The Southern India is known for its diversity and there are many places, whic(景区) in South India include Goa, Cochin, Kerala, Munnar, Periyar, Kottayam and the list goes on and on.
1.The main purpose of this passage is .
A. to report some important events in the history of India
B. to introduce some tours that can explore the history of India
C. to help study the culture and history of India
D. to tell us how to explore the history of India
2.Many tourists prefer to travel to and explore because .
A. modern India has little to study
B. Indian people have an interesting lifestyle
C. its culture is greatly influenced by its history
D. India’s history is longer than that of any other country
3.Most forts were built in order to .
A. honor the kings B. act as a palace for queens
C. keep enemies away D. attract tourists
4.According to the passage, Rajput heritage .
A. is a famous fort in India
B. is one of the heritages in India
C. has a history of no more than 200 years
D. lies in South India
高一英语阅读理解中等难度题查看答案及解析
阅读表达（共5小题；每小题2分，满分10分）
【1】The air was pleasant and the music was loud in the vast square in front of the New York State office building in Harlem(哈莱姆， 美国纽约市黑人居住区) as health advocates（支持者，提倡者） set up information tables for Harlem wellness Week. It was a wide-ranging effort to educate people about non-communicable diseases: Heart disease, cancer, lung disease, obesity, and so on.
【2】There is an economic effect caused by these diseases, especially in Harlem, one of the city’s poorest districts. Without healthy employees and healthy customers, you cannot have healthy business, says Patricia Ricketts of the Greater Harlem Chamber of Commerce, which sponsors Wellness Week.
【3】Dr. Jo Ivy Boufford is president of the New York Academy of Medicine, a Wellness Week partner. She says education about better nutrition is important, but that people with low incomes often lack the means to put what they know into practice. But there is hope. New York is very active in adovating good, effective public health policies. “New York City has banned smoking in public places, both indoors and outdoors. That is a fantastic example of what can be done, without having any impact on the economy. It is a city where you have bike paths. That is a good message for the world, because bikes make your transport active. That is good for your health and lowers air pollution,” she said.
【4】“It is not enough to focus on the management of disease through medication,” Dr. Boufford says. “That’s why health advocates will be trying to persuade UN officials during Wellness Week to pass resolutions that deal with road and transport design and construction and other potential causes of non-communicable diseases.”
1.What is the main idea of the text? (no more than 8words)
________
2.Complete the following statement with words from Paragraph【4】.(no more than 3words)_______________ the management of disease through medication is not enough.
________
3.What noninfectious diseases are mentioned in the text?( no more than 6 words)
________
4.why not? (no more than 16 words)
________
5.What does the word “That”(paragraph 3) refer to?(no more than 4 words)
________
高一英语信息匹配困难题查看答案及解析
.
______ it is to have a bath in the ocean in hot summer.
| A．How fun | B．How a fun | C．What a fun | D．What fun |
高一英语单项填空简单题查看答案及解析
They multiplied and filled the oceans and seas with oxygen, _____ encouraged the later development of early shellfish and all sorts of fish.
A．that B．where C．when D．which
高一英语单项填空中等难度题查看答案及解析