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Scientists have discovered thirteen kinds of vitamins. They say vitamins help to carry out chemical changes within cells. If we do not get enough of the vitamins we need in our food, we are at risk of developing a number of diseases. Which foods should be eaten to keep us healthy? Let us look at some important vitamins.
Vitamin A helps prevent skin and other tissues from becoming dry. People who do not get enough vitamin A cannot see well in darkness. Vitamin A is found in fish liver oil and the yellow part of eggs.
Vitamin B-1 is also called thiamine. Thiamine changes starchy（含淀粉的）foods into energy. Thiamine is found not just in whole grains like brown rice, but also in beans and peas, nuts, and meat and fish.
Vitamin B-12 is needed so folic acid can do its work. Together, they help produce red blood cells. Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy. Vitamin B-12 is found naturally in foods like eggs, meat, fish and milk products. Vitamin B-12 is found in green leafy vegetables and other foods, like legumes and citrus fruits （柑橘类水果).
Vitamin C is needed for strong bones and teeth. The body stores little vitamin C. So we must get it every day in foods such as citrus fruits, tomatoes and uncooked cabbage.
Vitamin D prevents the children’s bone disease rickets （佝偻病）. Ultraviolet light from the sun changes a substance in the skin into vitamin D. Fish liver oil also contains vitamin D.
Vitamin K is needed for healthy blood. It thickens the blood around a cut to stop bleeding. It can also be found in pork products, liver and in vegetables like cabbage, kale and spinach （菠菜）.
Vitamins are important to our health. A lack of required vitamins can lead to health problems.
1.What is the main idea of the passage?
A. There are thirteen kinds of vitamins in total.
B. One can not live without enough vitamins.
C. Vitamins can carry out chemical changes within cells.
D. Enough vitamins are vital to keep healthy.
2.Women who wish to become mothers should take in ________.
A. vitamin A B. vitamin B-1
C. vitamin B-12 D. vitamin C
3.What can change a substance in the skin into vitamin D?
A. Fish liver oil.
B. Ultraviolet light from the sun.
C. Fresh milk drunk by people.
D. Doing a certain amount of exercise.
4.According to the passage, taking in enough vitamin C can ________.
A. make our eyesight better
B. help to stop bleeding
C. make our bones and teeth strong
D. help produce red blood cells
高三英语阅读理解中等难度题查看答案及解析
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Just when scientists think they have discovered and recorded every species of insect that crawls the earth they find something new. Earlier this month, Peter Jager, the head of Frankfurt’s Senckenberg Research Institute reported the discovery of a unique eyeless spider.
The creature that has a leg span (跨度) of six centimeters and a body size of just twelve millimeters was found in a cave inside the tiny nation of Laos, in Southeast Asia. It was identified as a member of the Huntsman spider, a large family that consists of 1100 species. However, the other members of the family all have eyes. The spider is the first one that has no eyes. They believe that the kind of spider has adapted to the fact that they do not really need the eyes to such a degree that they have dispensed with them altogether.
But they are not the only creature to have done that. Over the years, scientists have discovered completely blind cave fish, and even a freshwater crab, which happens to live in the same cave as this eyeless spider!
Surrounded by Burma and China on the northwest, Vietnam on the east, Cambodia on the south and Thailand on the west, the landlocked nation of Laos is filled with a large number of new and exotic (新奇的) species. In the last few years researchers have discovered the Saola—never-before-seen antelope-like creature, a small deer species called muntjacs, a tiny stripped rabbit and a rock rat that was thought to have been extinct 11 millions years ago. In addition to that it is also home to over one hundred species of large mammals ranging from tigers to macaques and over 165 species of amphibians (两栖动物) and reptiles like the terrible King cobra and the noisy Tokay gecko, a permanent resident inside most Laos households.
64. 1.Which of the following is the best title of passage?
A．Laos full of a large number of exotic species
B．Laos popular with plenty of strange species
C．Every species of insect discovered and recorded by scientists
D．World’s first eyeless spider discovery in Southeast Asia.
65. 2.What does the second paragraph mainly tell us about the unique eyeless spider?
A．The eyesight, identification and family members.
B．The size, identification and the reason for being eyeless
C．The body, species and living environment
D．The size, identification and the species
66. 3.The underlined part “dispensed with” (in 2nd Para) means _________.
A．got rid of B．put up with C．carried away D．taken no notice of
高三英语阅读理解中等难度题查看答案及解析
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Scientists who discovered a new way of generating electricity from water say they may have come across an alternative source of clean energy to rival wind and solar power.
The breakthrough, which scientists say is the first new way to generate electricity in 160 years, could lead to batteries that use water instead of poisonous substances.
The scientists made the discovery when they were investigating what happens when tap water is forced through extremely narrow glass tubes. Water squeezed down the tubes, each of which was narrower than a tenth the thickness of a human hair, generating a small electric current that ran the length of the tube. To produce a larger electric current, the team tried forcing water through a glass water filter(滤水器)that contained thousands of narrow channels lined up side by side. “When we took a syringe(注射器)of water and squeezed it through the filter, we got enough power to light a light bulb,” said Larry Kostiuk of the University of Alberta in Canada. “The harder you push the syringe, the more electric current you get.”
The current is produced because of an effect in the glass tubes. When they are filled with water, positively charged ions(阳离子)fixed in the tubes are washed away, leaving a slight negative charge on the glass surface. When water is then forced along the tube, the surface repels negatively charged ions in the water while positively charged ions are attracted down the tube. The result is a net flow of positively charged ions that sets up an electric current.
According to Dr Kostiuk, no one has ever thought to use water to produce electricity in this way. “The last time someone came up with a way of generating electricity was Michael Faraday in 1839,” he said. “So this is the first new way of generating electricity in 160 years, which is why we are so excited about it.”
Dr Kostiuk says water batteries might one day be used to power mobile phones and calculators, but admitted that the engineering challenges might make other applications more realistic. “You’d need to be sure it wouldn’t leak, and you’d need to make sure it wouldn’t freeze,” he said.
More likely would be to install the electricity-generating devices where water is already being pumped, such as at city water filtration sites, he said. “It could compete with wind and solar power,” he added.
1.What does the passage mainly want to tell us about?
A. A kind of solar power discovered by scientists.
B. A kind of new energy source found in tap water.
C. The breakthrough to generate electricity 160 yeas ago.
D. A kind of new battery invented without poisonous substances.
2.The underlined word “repels” in Paragraph 4 is closest in meaning to _________.
A. rejects B. identifies C. attracts D. rebels
3.Why were the scientists extremely happy about their new discovery?
A. They were the first to find a new way to produce electricity.
B. They could make an electric current to light a light bulb.
C. Their discovery could be used to invent water batteries.
D. Their discovery was made 160 years earlier than Faraday’s.
4.What can we infer about potential water batteries?
A. They must be used to power mobile phones and calculators.
B. They have some possible disadvantages like water leaking.
C. They would be needed greatly at city water filtration sites.
D. They would be better than wind and solar power.
高三英语阅读理解困难题查看答案及解析
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Paragraph 1
Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds. (2) citrus(柑桔) fruits and tomatoes; (3) potatoes and other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal(谷类), rice is also in this kind of food; (7) butter, or something like butter.
Paragraph 2
People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways. People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.
Paragraph 3
There are two problems, then, in feeding the large number of people on earth. The first is to find some ways to feed the world’s population so that no one is hungry.The second is to make sure that people everywhere have the right kinds of food to make them grow to be strong and healthy.
1.According to the scientists, which of the following groups of food is the healthiest for your lunch?
A. chicken, apples, cereal, cabbages B. potatoes, carrots, rice, bread
C. oranges, bananas, fish, tomatoes D. beef, pork, fish, milk
2.It is important for people to eat _______.
A. three times a day B. dinner at twelve o’clock
C. cooked food all the day D. something from each of the seven kinds of food every day
3.People in different countries and different places of the world _______.
A. has the right kinds of food to eat B. cooks their food in the same way
C. has their meals at the same time D. eat food in different ways
4.If there is Paragraph 4, what do you think is going to be talked about?
A. When people eat their lunch B. What to do with the two problems
C. How to cook food in different ways D. Why people eat different kinds of food
高三英语阅读理解困难题查看答案及解析
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Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds. (2) citrus(柑桔) fruits and tomatoes; (3) potatoes and other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal(谷类), rice is also in this kind of food; (7) butter, or something like butter.
Paragraph 2
People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways. People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw(生的) or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.
Paragraph 3
There are two problems, then, in feeding the large number of people on earth. The first is to find some ways to feed the world’s population so that no one is hungry.
The second is to make sure that people everywhere have the right kinds of food to make them grow to be strong and healthy.
1.According to the scientists, which of the following groups of food is the healthiest for your lunch?
A. chicken, apples, cereal, cabbages
B. potatoes, carrots, rice, bread
C. oranges, bananas, fish, tomatoes
D. beef, pork, fish, milk
2.It is important for people to eat _______.
A. three times a day
B. dinner at twelve o’clock
C. cooked food all the day
D. something from each of the seven kinds of food every day
3.People in different countries and different places of the world _______.
A. has the right kinds of food to eat
B. cooks their food in the same way
C. has their meals at the same time
D. eat food in different ways
4.If there is Paragraph 4, what do you think is going to be talked about?
A. When people eat their lunch
B. What to do with the two problems
C. How to cook food in different ways
D. Why people eat different kinds of food
高三英语阅读理解中等难度题查看答案及解析
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Scientists say they have discovered a promising treatment for sleeping sickness, a killer disease that infects(感染) about 60,000 people in Africa a year.
British and Canadian experts say drugs could attack the parasite（寄生虫） causing the illness needs to survive. They say the drug could be ready for human medical test in about 18 months.
The disease, spread by the bite of a fly, is caused by a parasite attacking the central nervous system. It has similar symptoms（症状） to malaria（疟疾）, making it difficult to diagnose. Left untreated, it moves to the brain, resulting in mental confusion and final death
The "breakthrough" came at the University of Dundee in Scotland, where scientists were offered money to research diseases ignored by major drugs companies.
Professor Paul Wyatt, director of the programme, said: "This is one of the most significant findings made in recent years in terms of drug discovery and development for ignored diseases."
He said the research, published in the journal Nature, represented "significant progress" in the development of a full blown drug against the disease.
The World Health Organization said there are between 50,000 and 70,000 cases of the disease a year, with a further 60 million people at risk of infection.
The research in Dundee was backed by partners at the University of York in England and the Structural Genomics Consortium in Toronto, Canada. The two drugs currently available to treat sleeping sickness both have problems. One is with side effects that kill one in 20 patients and the other is costly, only partially effective and requires long-time hospital treatment, the scientists said.
1.The word backed in the last paragraph probably means_____.
A. conducted B. supported C. believed D. managed
2.What the World Health Organization said suggested that______.
A. about 60000 people died of the disease each year
B. about 60000 people were cured of the disease each year
C. 600 million people are likely to get infected
D. the disease is spreading fast in Africa
3.We can read this passage______.
A. in the journal Nature
B. in a newspaper of the University of Dundee
C. in a book about flies
D. in a newspaper about medicine
4.We can learn from the passage that______ .
A .big drug companies play an important role in the research of the new drug
B. people who get infected with the disease are mentally disturbed
C. among 200 people infected with the disease, 5 may die because of the old drug
D. Professor Paul Wyatt may be a professor at the University of York
高三英语阅读理解简单题查看答案及解析
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Scientists say they have discovered a promising treatment for sleeping sickness, a killer disease that infects(感染) about 60,000 people in Africa a year．
British and Canadian experts say drugs could attack the parasite（寄生虫） causing the illness．They say the drug could be ready for human medical test in about 18 months．
The disease, spread by the bite of a fly, is caused by a parasite attacking the central nervous system．It has similar symptoms（症状） to malaria（疟疾）, making it difficult to diagnose．Left untreated, it moves to the brain, resulting in mental confusion and final death
The "breakthrough" came at the University of Dundee in Scotland, where scientists were offered money to research diseases ignored by major drugs companies．
Professor Paul Wyatt, director of the programme, said: "This is one of the most significant findings made in recent years in terms of drug discovery and development for ignored diseases."
He said the research, published in the journal Nature, represented "significant progress" in the development of a full blown drug against the disease．
The World Health Organization said there are between 50,000 and 70,000 cases of the disease a year, with a further 60 million people at risk of infection．
The research in Dundee was backed by partners at the University of York in England and the Structural Genomics Consortium in Toronto, Canada．The two drugs currently available to treat sleeping sickness both have problems．One is with side effects that kill one in 20 patients and the other is costly, only partially effective and requires long-time hospital treatment, the scientists said．
1.The word backed in the last paragraph probably means_____.
A．conducted B．supported C．believed D．managed
2.What the World Health Organization said suggested that______.
A．about 60000 people died of the disease each year
B．about 60000 people were cured of the disease each year
C．600 million people are likely to get infected
D．the disease is spreading fast in Africa
3.We can read this passage______.
A．in the journal Nature
B．in a newspaper of the University of Dundee
C．in a book about flies
D．in a newspaper about medicine
4.We can learn from the passage that______．
A．big drug companies play an important role in the research of the new drug
B．people who get infected with the disease are mentally disturbed
C．among 200 people infected with the disease, 5 may die because of the old drug
D． Professor Paul Wyatt may be a professor at the University of York
高三英语阅读理解简单题查看答案及解析
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Scientists at Royal Holloway, University of London and Queen Mary, University of London have discovered that bees learn to fly the shortest possible route between flowers even if they discover the flowers in a different order. Bees are effectively solving the “traveling salesman problem”, and they are the first creatures found to do this.
The traveling salesman must find the shortest route that allows him to visit all locations on his route. Computers solve it by comparing the length of all possible routes and choosing the shortest, and it can keep computers busy for days. However, bees solve it without computer assistance using a brain the size of grass seed. Dr. Nigel Raine, from the School of Biological Sciences at Royal Holloway explains, “Bees solve traveling salesman problems every day. They visit flowers at multiple locations and because bees use lots of energy to fly, they find a route which keeps flying to a minimum. ”
The team used the computer to control artificial flowers to test whether bees would follow a route defined by the order in which they discovered the flowers or if they would find the shortest route. After exploring the location of the flowers, bees quickly learned to fly the shortest route.
As well as improving our understanding of how bees move around the landscape pollinating(授粉)crops and wild flowers, this research, which is due to be published in The American Naturalist, has other applications. Our lifestyle relies on networks such as traffic on the roads, information flow on the Web and business supply chains. By understanding how bees can solve their problems with such a tiny brain, we can improve our management of these everyday networks without needing lots of computer time. Dr. Raine adds, “Despite their tiny brains, bees are capable of extraordinary feats of behavior. We need to understand how they can solve the traveling salesman problem without a computer. ”
1. What would be the best title of the passage?
A. Bees help salesmen travel
B. Tiny-brained bees solve a complex mathematical problem
C. How bees discover the flowers
D. How to solve the “traveling salesman problem”
2.We may infer from the second paragraph that the “traveling salesman problem” .
A. can be solved by a computer easily
B. can’t even be solved by a computer
C. can puzzle both people and computers
D. remains to be solved by scientists
3. The main purpose of the last paragraph is to .
A. provide further proof for the research
B. tell us how bees can fly the shortest route between flowers
C. tell us how the research about bees’ flying route was conducted
D. explain the importance of the research
4. It can be concluded from the passage that .
A. all creatures are smarter than computers
B. the research about bees’ flying route can be applied to many fields
C. our networks are more complex than bees’ ones
D. with the help of the computer we can find out how bees can solve the “traveling salesman problem”
高三英语阅读理解中等难度题查看答案及解析
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SCIENTISTS have discovered that living to the age of 100 may have nothing to do with the lifestyle you lead and everything to do with the type of genes (基因) you have.
For the lucky carriers of “Methuselah” genes, worries over smoking, eating unhealthily and not getting enough exercise may not be as necessary as to those of us without the special gene pattern .
The “Methuselah” genes could give extra protection against the diseases of old age such as cancer and heart disease. They could also protect people against the effects of the unhealthy lifestyles that we believe will lead us to an early death, scientists say. However, the genes are very rare.
The genes include ADIPOQ, which is found in about 10 percent of young people but in nearly 30 percent of people living past 100. They also include the CETP and the ApoC3 genes, which are found in 10 percent of young people, but in about 20 percent of people over 100 years old.
Some of those genes were discovered by a research group at the Albert Einstein College of Medicine in New York, led by Professor Nir Barzilai. The team studied the genes of over 500 people over 100 years old, and their children.
The studies show that tiny mutations (变异) in the make-up of some genes can greatly increase a person’s lifespan. Barzilai told a Royal Society conference that the discovery of such genes gave scientists clear targets for developing drugs that could prevent age-related diseases, allow people to live longer and stay healthy.
David Gems, a researcher at University College London, believes that drugs to slow ageing will become widespread.
“If we know which genes control longevity (长寿) then we can … target them with drugs. That makes it possible to slow down ageing,” he told The Times.
“Much of the pain and suffering in the world are caused by ageing. If we can find a way to reduce that, then we are obliged to take it.”
1. According to the article, which of the following is the most important if a person is to live to the age of 100?
A. Eating healthy food every day.
B. Having the right types of genes.
C. Having a healthy lifestyle.
D. Taking drugs that prevent ageing.
2.According to the article, the ApoC3 gene is found in ______ of people over 100 years old.
A. 10% B. 20% C. 30% D. 50%
3.Which of the following statements is TRUE of the research led by Professor Nir Barzilai?
A. The team studied the genes of over 100 people over 100 years of age.
B. The researchers found that mutations in certain genes lead to longer life.
C. The researchers found ways to develop drugs that could cure age-related diseases.
D. The study suggested that most people have genes that could lengthen their lives.
4. According to David Gems, ______.
A. drugs to slow ageing will be very expensive
B. modern science will be able to find more longevity genes
C. it is the duty of medical scientists to fight the problems of ageing
D. scientists can make new genes that will allow longer life
高三英语阅读理解中等难度题查看答案及解析
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Scientists have discovered that living to the age of 100 may have nothing to do with the lifestyle you lead and everything to do with the type of genes you have.
For the lucky carriers of “Methuselah” genes， worries over smoking， eating unhealthily and not getting enough exercise may not be as necessary as to those of us without the special gene pattern. The “Methuselah” genes could give extra protection against the diseases of old age such as cancer and heart disease. They could also protect people against the effects of the unhealthy lifestyles that we believe will lead us to an early death， scientists say. However， the genes are very rare.
The genes include ADIPOQ， which is found in about 10 percent of young people but in nearly 30 percent of people living past 100. They also include the CETP and the ApoC3 genes， which are found in 10 percent of young people， but in about 20 percent of people over 100 years old.
Some of those genes were discovered by a research group at the Albert Einstein College of Medicine in New York， led by Professor Nir Barzilai. The team studied the genes of over 500 people over 100 years old， and their children.
The studies show that tiny mutations (变异) in the make-up of some genes can greatly increase a person’s lifespan. Barzilai told a Royal Society conference that the discovery of such genes gave scientists clear targets for developing drugs that could prevent age-related diseases， allow people to live longer and stay healthy.
David Gems， a researcher at University College London， believes that drugs to slow ageing will become widespread.
“If we know which genes control longevity (长寿) then we can... target them with drugs. That makes it possible to slow down ageing，” he told The Times.
“Much of the pain and suffering in the world are caused by ageing. If we can find a way to reduce that， then we are obliged to take it.”
1.Which genes could give extra protection against the diseases of old age？ (No more than 3 words) (2 marks)
__________________________________________________________________________
2. Whom did Barzilai’s team study？ (No more than 10 words) (2 marks)
__________________________________________________________________________
3. What can greatly increase a person’s lifespan？ (No more than 10 words) (3 marks)
__________________________________________________________________________
4.What can scientists do if they are aware which genes control longevity？(No more than 6 words) (3 marks)
__________________________________________________________________________.
高三英语其他题中等难度题查看答案及解析