Europe’s deadly outbreak of a rare form of E. coli bacteria (大肠杆菌) has brought new attention to food safety issues. One of the problems when people get sick from food is that the simplest question is often difficult or even impossible to answer. Just what did the people eat that made them sick?
Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply. This is easier said than done, but scientists keep looking for new ways.
Scientists in the United States have developed an experimental system that uses a high-tech optical scanner. The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce. These can be sources of E. coli. E. coli bacteria naturally live in the intestines(肠) of humans and many animals. Most kinds of E. coli are harmless but some can make people sick.
The new scanner can also show damage and imperfections that might make the produce unappealing to shoppers.
Scientists designed the system at a Department of Agriculture research center in Beltsville, Maryland. Moon Kim of the Agricultural Research Service led the team.
MOON KIM: “We were requested, we were asked, to develop a method to detect contamination in produce. So we started with the apple as the model sample.”
The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along. As the apples move along the belt, the scanner captures images of each piece of fruit.
Moon Kim says the team hopes the system will be available before long.
MOON KIM: “We are targeting for development in commercial plants for the next several years.”
The scanner can direct a sorting machine to separate the bad apples from the good ones. The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.
1.What is the main topic of the text?
A. Bacteria. B. A high-tech scanner. C. A camera D. Food safety.
2.E. coli bacteria ______.
A. broke out all over the world B. comes from soil or animal waste
C. is extremely harmful to health D. does not cause illness
3.The high-tech scanner ______.
A. can help to sort out different fruits
B. make the produce appeal to shoppers
C. can only capture images of the whole apple
D. can identify the presence of contaminants
4.What can be inferred from the text?
A. The scanner needs to be improved.
B. The scanner will be available in the next several years.
C. Moon Kim is unwilling to develop the scanner.
D. The scanner is connected to a sorting machine.
高三英语阅读理解中等难度题
Europe’s deadly outbreak of a rare form of E. coli bacteria (大肠杆菌) has brought new attention to food safety issues. One of the problems when people get sick from food is that the simplest question is often difficult or even impossible to answer. Just what did the people eat that made them sick?
Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply. This is easier said than done, but scientists keep looking for new ways.
Scientists in the United States have developed an experimental system that uses a high-tech optical scanner. The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce. These can be sources of E. coli. E. coli bacteria naturally live in the intestines(肠) of humans and many animals. Most kinds of E. coli are harmless but some can make people sick.
The new scanner can also show damage and imperfections that might make the produce unappealing to shoppers.
Scientists designed the system at a Department of Agriculture research center in Beltsville, Maryland. Moon Kim of the Agricultural Research Service led the team.
MOON KIM: “We were requested, we were asked, to develop a method to detect contamination in produce. So we started with the apple as the model sample.”
The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along. As the apples move along the belt, the scanner captures images of each piece of fruit.
Moon Kim says the team hopes the system will be available before long.
MOON KIM: “We are targeting for development in commercial plants for the next several years.”
The scanner can direct a sorting machine to separate the bad apples from the good ones. The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.
1.What is the main topic of the text?
A. Bacteria. B. A high-tech scanner. C. A camera D. Food safety.
2.E. coli bacteria ______.
A. broke out all over the world B. comes from soil or animal waste
C. is extremely harmful to health D. does not cause illness
3.The high-tech scanner ______.
A. can help to sort out different fruits
B. make the produce appeal to shoppers
C. can only capture images of the whole apple
D. can identify the presence of contaminants
4.What can be inferred from the text?
A. The scanner needs to be improved.
B. The scanner will be available in the next several years.
C. Moon Kim is unwilling to develop the scanner.
D. The scanner is connected to a sorting machine.
高三英语阅读理解中等难度题查看答案及解析
Europe’s deadly outbreak of a rare form of E. coli bacteria (大肠杆菌) has brought new attention to food safety issues. One of the problems when people get sick from food is that the simplest question is often difficult or even impossible to answer. Just what did the people eat that made them sick?
Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply. This is easier said than done, but scientists keep looking for new ways.
Scientists in the United States have developed an experimental system that uses a high-tech optical scanner. The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce. These can be sources of E. coli. E. coli bacteria naturally live in the intestines(肠) of humans and many animals. Most kinds of E. coli are harmless but some can make people sick.
The new scanner can also show damage and imperfections that might make the produce unappealing to shoppers.
Scientists designed the system at a Department of Agriculture research center in Beltsville, Maryland. Moon Kim of the Agricultural Research Service led the team.
MOON KIM: “We were requested, we were asked, to develop a method to detect contamination in produce. So we started with the apple as the model sample.”
The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along. As the apples move along the belt, the scanner captures images of each piece of fruit.
Moon Kim says the team hopes the system will be available before long.
MOON KIM: “We are targeting for development in commercial plants for the next several years.”
The scanner can direct a sorting machine to separate the bad apples from the good ones. The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.
1.What is the main topic of the text?
A.Bacteria. B.A high-tech scanner.
C.A camera D.Food safety.
2.E. coli bacteria ______.
A.broke out all over the world B.comes from soil or animal waste
C.is extremely harmful to health D.does not cause illness
3.The high-tech scanner ______.
A.can help to sort out different fruits
B.make the produce appeal to shoppers
C.can only capture images of the whole apple
D.can identify the presence of contaminants
4.What can be inferred from the text?
A.The scanner needs to be improved.
B.The scanner will be available in the next several years.
C.Moon Kim is unwilling to develop the scanner.
D.The scanner is connected to a sorting machine.
高三英语阅读理解中等难度题查看答案及解析
Europe’s deadly outbreak of a rare form of E. coli bacteria (大肠杆菌) has brought new attention to food safety issues. One of the problems when people get sick from food is that the simplest question is often difficult or even impossible to answer. Just what did the people eat that made them sick?
Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply. This is easier said than done, but scientists keep looking for new ways.
Scientists in the United States have developed an experimental system that uses a high-tech optical scanner. The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce. These can be sources of E. coli. E. coli bacteria naturally live in the intestines (肠) of humans and many animals. Most kinds of E. coli are harmless but some can make people sick.
The new scanner can also show damage and imperfections that might make the produce unappealing to shoppers.
Scientists designed the system at a Department of Agriculture research center in Beltsville, Maryland. Moon Kim of the Agricultural Research Service led the team.
MOON KIM: “We were requested, we were asked, to develop a method to detect contamination in produce. So we started with the apple as the model sample.”
The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along. As the apples move along the belt, the scanner captures images of each piece of fruit.
Moon Kim says the team hopes the system will be available before long.
MOON KIM: “We are targeting for development in commercial plants for the next several years.”
The scanner can direct a sorting machine to separate the bad apples from the good ones. The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.
1.What is the main topic of the text?
A. Bacteria B. A high-tech scanner
C. A camera D. Food safety
2.E. coli bacteria ________.
A. broke out all over the world
B. comes from soil or animal waste
C. is extremely harmful to health
D. does not cause illness
3.The high-tech scanner ________.
A. can help to sort out different fruits
B. make the produce appeal to shoppers
C. can only capture images of the whole apple
D. can identify the presence of contaminants
4.What can be inferred from the text?
A. The scanner needs to be improved.
B. The scanner will be available in the next several years.
C. Moon Kim is unwilling to develop the scanner.
D. The scanner is connected to a sorting machine.
高三英语阅读理解中等难度题查看答案及解析
The largest outbreak of the deadly disease Ebola(埃博拉) was caused by an infected bat biting a toddler, say a group of international researchers.
The 17-strong team of European and African tropical disease researchers, ecologists and anthropologists have spent three weeks investigating the outbreak of the disease in Guinea, Liberia, Ivory Coast and Nigeria. The researchers captured the bats and other creatures near the village of Meliandoua in remote eastern Guinea, where the disease began in December 2013. The boy was bitten and passed the infection on to his mother and both died within a week. The disease was then spread far and wide by the people who came to the funeral.
Most of the previous outbreaks have been caused by meat from dead infected animals collected by hunters who then sell it on. Fruit bats, however, are widely eaten in rural West Africa.
The team, led by epidemiologist(流行病学家) Herr Leendertz, a disease ecologist at the Robert Koch Institute in Berlin, are expected to publish their results in a major journal soon.
Herr Leendertz’s team believe that an infected straw-colored fruit bat brought the disease to Guinea. The mammals are known to travel long distances and usually settle in forests near cities. Herr Leendertz said, “ The evidence is not 100 percent and we can only say that it is possible. They can travel far in one night. I don't think an individual bat or colony(群体) migrated all the way from Congo or Gabon to West Africa. These big colonies are connected. There is a possibility for the virus to mix between colonies. The bats share the same fruit. It is likely not to have even been one species of bat. The virus may jump from one species to another."
If the bat theory is confirmed, the locals would try to destroy the colonies, which, Herr Leendertz says, would be an ecological disaster, because bats pollinate(传授花粉) plants and kill insects. And bat hunts would also only increase human contact with potentially infected animals.
1.What’s the purpose of the 17-strong team?
A. To look into the outbreak of Ebola.
B. To help the people who suffer from Ebola.
C. To help cure the infected boy of Ebola.
D. To make a study of the bats including fruit bats.
2.In Herr Leendertz’s opinion, ______.
A. people can do nothing to prevent the disease
B. the disease Ebola may jump from one species to another
C. the result of the research should be published immediately
D. the straw-colored fruit bats usually settle in forests in the rural areas
3.If the bat theory is confirmed, ______.
A. the disease Ebola will be controlled
B. all the fruit bats in Africa would be killed
C. plants would not be pollinated in the future
D. the ecosystem in Africa might lose its balance
4.What’s the main idea of this passage?
A. A toddler was bitten by a bat and died.
B. The disease Ebola is incurable at present.
C. An infected bat caused the outbreak of Ebola.
D. The deadly disease Ebola broke out in Guinea.
5.This passage can probably be classified as ______.
A. a science fiction B. a news report
C. a lecture essay D. an auto-biography
高三英语阅读理解中等难度题查看答案及解析
Coal was formed out of dead forests by chemical ______ .
A. produce B. processes C. product D. Progress
高三英语单项填空中等难度题查看答案及解析
Smog in Europe and North America could be more than 25 times more deadly than the average air pollution found in Chinese cities, a new study suggests. In the largest ever study of its kind in the developing world, researchers tested the effects of air pollution on the health of people in 272 cities in China.
They found average annual exposure to fine particles, known as PM2.5, in those cities was more than five times higher than the level recommended by the World Health Organization (WHO), according to a paper in the American Journal of Respiratory and Critical Care Medicine.
However they also discovered that it was much less likely to increase the death rate than PM2.5 in Europe and North America.
The researchers, led by Dr Maigeng Zhou, of the Chinese Centre for Disease Control and Prevention, suggested this was because China is affected by large amounts of natural dust blown by the wind from arid areas, while most pollution in the West comes from industry.
They found that for every increase of 10 micrograms of air pollution in a cubic meter of air, the mortality rate increased by 0.22 percent, discounting deaths from accidents.
Professor Frank Kelly, an expert in environmental health at King’s College London, who was not involved in the study but has studied air pollution in China, told The Independent: “Those relative risks are considerably less than those seen in Europe and the US. For mortality(死亡率) in Europe we are working on a six percent increase per 10 micrograms.” That suggests air pollution in Europe is about 27 times more toxic than average air pollution in China.
However, Professor Kelly said cities like Beijing, Shanghai and Hong Kong were likely to suffer from Western-style air pollution. "The natural dust component there is not of the magnitude that it would dwarf the coal, biomass and fossil fuel signals,” he said, “That may be true in certain cities whose pollution is not dominated by local power generation or major traffic congestion.”
Natural dust particles can cause physical damage to the lungs and trigger an asthma attack. Particles of carbon produced when fossil fuels are burned can lead to similar problems but they are also coated with toxic heavy metals, chemicals and volatile organic compounds. These are able to pass from the lungs into the blood stream where it is thought they cause further damage to the body.
Areeba Hamid, an air pollution campaigner with environmental group Greenpeace, said: “Poisonous air causes damage to people’s health wherever in the world they live. We now know fumes from diesel(柴油机) vehicles are a lot more poisonous than car companies claimed and this is a big cause of air pollution in Europe and North America. These companies have a lot to answer for, but so far they’ve managed to avoid any real accountability.”
The study of cities in China found the average annual expose to PM2.5 was 56 micrograms per cubic meter, compared to the WHO guideline limit for safe air quality of 10 micrograms.
People who were older than 75, had less education or who lived in hotter places were more likely to die. It is thought people in warmer cities were more likely to spend time outside or leave their windows open, thereby breathing more polluted air, the researchers said. They also speculated that less well educated people might have poorer access to health care or experience poorer environmental health conditions.
1.Why PM2.5 in China is less deadly than that in Europe and North America?
A. China is free from any pollution about PM2.5.
B. Pollutants affecting China mainly come from arid areas.
C. Fewer people died from PM 2.5 in China than those in Europe and North America.
D. Europe and North America are polluted by natural dust.
2.What does the underlined part in Para 7 refer to?
A. The average mortality rate. B. The higher mortality rate.
C. The lower mortality rate. D. The normal mortality rate.
3.What’s the real cause of air pollution in Europe and North America according to Areeba Hamid?
A. Fumes from diesel vehicles are much more poisonous.
B. The environmental agencies can’t take on responsibilities.
C. The technology doesn’t meet the standards.
D. Car companies can’t evaluate the results.
4.The author’s purpose of writing the passage is to ________.
A. appeal to people to lay an emphasis on environmental protection
B. illustrate smog in Europe and North America is quite serious
C. demonstrate China is safest place in the world to live in
D. provide some good ways to address the smog
高三英语阅读理解困难题查看答案及解析
One of the methods of introducing foreign genes into a plant is to make use of certain
soil bacteria to infect the plant and transfer several of blue genes to the infected plant
cells, _____ in high rate of plant cell pision.
A.results | B.resulting | C.to result | D.resulted |
高三英语单项填空中等难度题查看答案及解析
The bacteria which inhabit (栖居于) human beings, particularly the guts (肠道) of those beings, have been found in recent years to be important for fighting off diseases. That something similar happens in other animal species is doubtless true as well. But work by Seon-Woo Lee at Dong-A University and Jihyun Kim at Yonsei University, both in South Korea, suggests that it is not only animals that benefit from such bacterial protection. Their study, just published in Nature Biotechnology, shows that plants do, too.
Crop plants of the nightshade family, such as potatoes and tomatoes, are not immune to a soil bacterium called Ralstonia solanacearum. This enters their roots and spreads through their water-transport systems, causing them to wilt (枯萎). Infection is usually deadly; the disease costs potato farmers alone $1bn a year. A variety of tomato called Hawaii 7996, however, does not suffer from such bacterial wilt. Dr Lee and Dr Kim wondered if the explanation for this exceptionalism lay with other bacteria in the soil.
To test that idea, they grew crops of Hawaii 7996 and a second tomato variety called Moneymaker. Once the plants were established, the researchers analyzed bacteria in the soil around the plants’ roots and found systematic differences that depended on which tomato variety was growing. This observation made their explanation reasonable and likely to be true.
They then transplanted some of their Moneymaker plants into soil that had previously supported Hawaii 7996s, and some of the Hawaiian plants into soil that had been home to Moneymakers. As controls, they similarly uprooted (拔起) individuals of both varieties and replanted them in soil once occupied by the same variety. That done, they exposed all of their plants to R. solanacearum and monitored them over the course of 14 days.
They found the disease progressed almost 30% more slowly in Moneymaker plants grown in “Hawaiian” soil than it did in those Moneymakers that had been replanted into their own soil. In contrast, it progressed rapidly in the normally resistant Hawaiian variety when this was transferred into Moneymaker soil.
Further study revealed that credit for this disease resistance went to a single type of soil bacterium, called TRM1. Dr Lee and Dr Kim therefore cultivated (培育) this bug in their laboratory and used it to treat soil into which Moneymaker plants were then planted. When these were infected with R. solanacearum they proved more resistant than others that had been planted into untreated soil as controls.
These findings suggest to Dr Lee and Dr Kim that the roots of Hawaii 7996 are releasing compounds (化合物) which encourage the growth of TRM1. What those compounds are has yet to be determined. The two researchers’ work, however, seems to suggest something constructive.
1.The author mentions the bacteria inhabiting human beings to introduce ___________.
A. the benefits of bacteria to humans B. the effects of bacteria on plants
C. the efforts to fight off diseases D. the reasons for plant diseases
2.What are the two researchers’ findings based on?
A. Comprehensive analyses of how plants are infected.
B. Careful observation of the transplanting process.
C. Controlled experiments on the uprooted individuals of both varieties.
D. Comparison of the progress of the disease in different conditions.
3.According to the study, why are some plants immune to infection?
A. They have better water-transport systems.
B. They are protected by some other bacteria.
C. They are genetically different from others.
D. They have resistance to bacteria when transferred.
4.The two researchers’ work indicates that _____________.
A. new ways will be found to deal with bacterial wilt
B. causes of some plant diseases have been discovered
C. a new chapter of agricultural science and technology has started
D. the composition of the compounds released has been identified
高三英语阅读理解困难题查看答案及解析
Today, the biggest killers stem as much from our lifestyles as from bacteria and viruses. One of the worst of these is heart disease, and specifically high blood pressure. It’s a slow, but efficient killer that robs many people of what should be the last 10, 20 or 30 years of their lives.
Scientists are claiming that they have now separated unusual ingredients in a rare seaweed discovered by fishermen off the coast of Korea that offer incredible health benefits—including the ability to restore blood pressure to normal levels.
Dr. Haengwoo Lee, a famous biochemist conducted a clinical study on these two ingredients. The first is Seanol, an extremely rare seaweed extract(浓缩物) from Ecklonia Cava that's proven to be 100 times more powerful than any land-based antioxidant(抗氧化剂). That's because it stays working in your body for 12 hours, compared to land-based antioxidants that work for 30 minutes. "Its secret is its make-up of special chemicals that are a huge 40% fat soluble( 可溶的)," Dr. Lee explains. "Unlike nearly all land-based antioxidants that are water soluble, Seanol's protective compounds can get into things like the fatty tissues of your brain and penetrate(渗透) all three layers of your cells, including the outside, the oil-based cell membranes(细胞膜), and your DNA." Indeed, Seanol is so powerful, it's the only FDA-approved Ecklonia Cava marine-algae (海藻) extract in existence.
The second ingredient is Calamarine, a deep-sea omega-3 discovery that delivers 85% more DHA omega-3s to your heart, brain, joints, and eyes. It's known to reduce the problems from tiredness and poor memory, joint pain, mood swings and depression.
With that research in mind, Dr. Lee combined Seanol and Calamarine with a high dose of vitamin D to form Marine-D3, the newest supplement in the fight against age-related illnesses and high blood pressure.
Dr. Lee found that Calamarine delivers some of the greatest concentration of omega-3s known to science. Combined with Seanol's ability to reduce body inflammation(炎症), as well as help cells get the nutrients they need to thrive, stay healthy and protected, Marine-D3 is able to boost a body's entire well being.
The makers of Marine-D3 are so confident that you'll see fast dramatic results from this product, that if you aren't happy after two full months, simply return the unused portion and they'll buy it back. They'll even give you ten dollars extra just for giving it an honest try! That kind of faith, combined with Dr. Lee's exhaustive research, shows that Marine-D3 really is a one-of-a-kind product.
1.From the first paragraph we can infer that ________.
A. Our lifestyles result from the biggest killers
B. our lifestyles do less harm to our bodies than bacteria and viruses do.
C. High blood pressure left untreated may cause shorter life.
D. Heart disease is incurable.
2.What can we know from paragraph 2 ?
A. Fishermen off the coast of Korea have isolated unusual ingredients.
B. Scientists have purified ingredients that can lower blood pressure to normal standard.
C. Scientists discovered a rare seaweed.
D. Scientists have imagined a medicine that treat blood pressure.
3.Which is right about Seanol ?
A. According to FDA , Seanol reaches the agreed standard.
B. Seanol can be fat soluble entirely.
C. Seanol is a common seaweed extract from Ecklonia Cava .
D. Seanol's protective compounds can get into all things like the fatty tissues of your brain.
4.What do we know about Calamarine?
A. Calamarine is easy to find in the surface of the sea.
B. Calamarine 's ability to reduce body inflammation(炎症) alone.
C. Calamarine has a low dose of vitamin D and C.
D. Calamarine may relieve you if you feel blue.
5.What’s the makers’ attitude toward Marine-D3?
A. pessimistic B. indifferent C. doubtful D. Optimistic
高三英语阅读理解中等难度题查看答案及解析
In 2004,the World Health Organization,WHO,warned of a possible outbreak of another serious disease which may be even more deadly than SARS.The WHO believes that it is likely that bird flu will spread to human beings in the next few years.If it does,up to seven millions people could die from the disease.
Diseases like bird flu are caused by viruses,that is,tiny things which change and be come more dangerous over time.When a new type of a common virus changes,it may be able to get past the body’s immune system.If that happens,humans are in great danger until a cure or treatment becomes available.
There have always been viruses and people always get sick,of course,but as we saw with SARS,the situation is more difficult today.People travel more than ever before,which means that disease can spread quickly and across large areas——in fact the whole world.
Scientists are already working on drugs that will prevent or limit the effect of a new virus,but the process takes time.It is just as important to make sure that countries,especially poor countries,are prepared to deal with the disease。New disease usually affect poor areas the most,so we must help develop health care in all countries.
64.The situation is more serious today because .
A.people travel more B.people don’t eat health food
C.there aren’t enough hospitals D.scientists can’t find a cure
65.From this passage we know .
A.bird flu will surely spread to human beings in the next few years.
B.a virus changes and become less dangerous over time.
C.SARS is 1ikely to come again in some years.
D.poor areas usually suffers more from new diseases than rich areas.
66.The possible title of this passage is
A.The Work of WHO
B.Scientists Are Working Hard on Drugs for Diseases
C.What Is a Virus
D.Virus Changes and Causes New Diseases Over Time
高三英语阅读理解简单题查看答案及解析