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Researchers have found more evidence that suggests a relationship between races (种族) and rates (率) of lung cancer among smokers. A new study shows that black people and Native Hawaiians are more likely to develop lung cancer from smoking. It compared their risk to whites, Japanese-Americans and Latinos.
Researchers at the University of Southern California and the University of Hawaii did the new study. The New England Journal of Medicine published the findings. The eight-year research studied more than 180,000 people. They included present and former smokers and people who never smoked. Almost 2.000 people in the study developed lung cancer.
Researchers say genetics (遗传学) might help explain the racial and ethnic（种族的） differences. There could be differences in how people's bodies react to smoke. But environmental influences, including the way people smoke, could also make a difference.
African-Americans and Latinos in the study are reported smoking the fewest cigarettes per day. Whites are the heaviest smokers. But the scientists point out that blacks have been reported to breathe cigarette smoke more deeply than white smokers. This could fill their lungs with more of the chemicals in tobacco that cause cancer.
Scientists know that some diseases effect different groups differently. And some drug companies have begun to develop racially targeted (针对) medicines. Last June, the United States Food and Drug Administration approved a drug designed to treat heart failure in black patients. The name is BiDil. The agency called it "a step toward the promise of personalized medicine."
1.Researchers agree that it is________that may probably determine black people’s risk of lung cancer.
A．the larger amount of smoking than white people
B．the living style or habit of the blacks
C．the depth of cigarette smoke into their lungs
D．the physical strength to react to cigarette smoke
2.People in the new study are made up of________.
A．heavy smokers in America B．smokers and non-smokers
C．the Asians and Hawaiians D．the black and white people
3.The production of BiDil referred to in the last paragraph is to________.
A．explain different races react to some diseases differently
B．tell the readers that racial differences exist in smokers
C．show a big step people have taken in the medicine area
D．support the idea that it is easy for blacks to have cancers
4.Which of the following statements is TRUE according to the author?
A．The way of smoking may increase the risk of lung cancer.
B．Race has nothing to do with the risk of having a lung cancer.
C．The research was started by the New England Journal of Medicine.
D．he risk of lung cancer lies I how much a person smokes.
高二英语阅读理解中等难度题查看答案及解析
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Researchers have found more evidence that suggests a relationship between races and rates of lung cancer among smokers. A new study shows that black people and Native Hawaiians are more likely to develop lung cancer from smoking. It compared their risk to whites, Japanese-Americans and Latinos.
Researchers at the University of Southern California and the University of Hawaii did the new study. The New England Journal of Medicine published the findings. The eight-year research studied more than 180,000 people. They included present and former smokers and people who never smoked. Almost 2,000 people in the study developed lung cancer.
Researchers say genetics might help explain the racial and ethnic differences. There could be differences in how people's bodies react to smoke. But environmental influences, including the way people smoke, could also make a difference.
African-Americans and Latinos in the study are reported smoking the fewest cigarettes per day. Whites are the heaviest smokers. But the scientists point out that blacks have been reported to breathe cigarette smoke more deeply than white smokers. This could fill their lungs with more of the chemicals in tobacco that cause cancer.
Scientists know that some diseases effect different groups differently. And some drug companies have begun to develop racially targeted medicines. Last June, the United States Food and Drug Administration approved a drug designed to treat heart failure in black patients. The name is BiDil. The agency called it "a step toward the promise of personalized medicine."
1.Which of the following orders is from higher to lower risk of having lung cancer?
A．Whites—Native Hawaiians
B．Africans—Americans—Latinos
C．Asians—Native Hawaiians
D．Africans—Americans—Native Hawaiians
2.Researchers agree that it is _____ that may probably determine black people’s risk of lung cancer.
A．the larger amount of smoking than white people
B．the living style or habit of the blacks
C．the depth of cigarette smoke into their lungs
D．the physical strength to react to cigarette smoke
3.People in the new study are made up of _____.
A．heavy smokers in America B．the black and white people
C．the Asians and Hawaiians D．smokers and non-smokers
4.The production of BiDil referred to in the last paragraph is to _____.
A．explain different races react to some diseases differently
B．tell the readers that racial differences exist in smokers
C．show a big step people have taken in the medicine area
D．support the idea that it is easy for blacks to have cancers
高二英语阅读理解困难题查看答案及解析
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Researchers have found clear and convincing evidence ________ happiness is
the key to better health and longer lives.
A. where B. whether C. how D. that
高二英语单项填空中等难度题查看答案及解析
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Researchers have just offered evidence in a study that says obesity appears to spread through social ties, much like a virus. When one person gains weight, their close friends often follow, but the finding might also offer hope.
If friends help make obesity acceptable, then might also be influential in losing the fat. The researchers note that support groups are already an effective tool in dealing with other socially influenced problems, like alcoholism.
The findings appeared in the New England Journal of Medicine, The researchers used information collected from 12,000 people. It was collected between 1971 and 2003 as part of the Framingham Heart Study.
The information was highly detailed. There was even contact information for close friends of the people in the study.
The researchers examined more than 40,000 social ties. They found that a person’s chances of becoming severely overweight increased by 57% if a friend had become obese.
Nicholas Christakis of Harvard Medical School was a lead investigator in the study. He says there is a direct causal relationship between a person getting fat and being followed in weight gain by a friend.
The study found that the sex of the friends was also an influence. In same-sex friendships, a person had a 70% increased risk of becoming obese. Men had a 44% increased risk of becoming obese after weight gain in brothers. In sisters, it was 67%. Between husbands and wives, it was a little less than 40%.
The researchers also considered the effect of where people lived in relation to each other. James Fowler of the University of California, San Diego, was the other lead investigator. He says a friend who lives a few hundred kilometers away has as much influence as one in the same neighborhood. He says the study demonstrates the need to consider that a major part of people’s health is tied to their social connections.
Both investigators say their research shows that obesity is not just a private medical issue, but a public health problem.
1.What does the underlined sentence in Para2.mean?
A. Obesity has a negative influence on a close friend.
B. Friends might also play a part in losing weight.
C. One might have a positive influence on one’s friend.
D. Friends usually don’t follow each other to lose weight.
2.Who is mostly likely to gain weight?
A. A man who has a fat brother.
B. A husband who has a fat wife.
C. A wife who has a fat husband.
D. A woman who a fat female friend.
3.Which of the following statements doesn’t the passage agree with?
A. You are sure to lose weight if you have a skinny friend.
B. If one gains weight, one’s friends are likely to get fat.
C. A person’s health is closely linked with his /her social relationship.
D. Even if the friend lives far away, the influence still remains.
4.The reason why the study involves both family members and friends is that _____.
A. researchers fail to find a more different sample
B. researchers have different ideas for family members and friends
C. researchers can meet these people regularly
D. researchers can compare the results
高二英语阅读理解中等难度题查看答案及解析
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Women are friendly．But men are more competitive．Why? Researchers have found it's all down to the hormone oxytocin （荷尔蒙催生素）．Although known as the love hormone, it affects the sexes differently．
"Women tend to be social in their behavior．They often share with others．But men lend to be competitive．They are trying to improve their social status," said Professor Ryan．
Generally, people believe that the hormone oxytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interactions （互动） such as falling in love or giving birth．
But in a previous experiment Professor Ryan found that the hormone is also let out in our body during negative social interactions such as envy．
Further researches showed that in men the hormone oxytocin improves the ability to recognize competitive relationships, but in women it raises the ability to recognize friendship．
Professor Ryan's recent experiment used 62 men and women aged 20 to 37．Half of the participants（参与者）received oxytocin．The other half received placebo （安慰剂）．
After a week, the two groups switched with participants．They went through the same procedure with the other material．
Following each treatment, they were shown some video pictures with different social interactions．Then they were asked to analyze the relationships by answering some questions．The questions were about telling friendship from competition．And their answers should be based on gestures, body language and facial expressions．
The results indicated that, after treatment with oxytocin, men's ability to correctly recognize competitive relationships improved, but in women it was the ability to correctly recognize friendship that got better．
Professor Ryan thus concluded: "Our experiment proves that the hormone oxytocin can raise people's abilities to better distinguish different social interactions．And the behavior differences between men and women are caused by biological factors （因素） that are mainly hormonal．"
1.What causes men and women to behave differently according to the text?
A. Placebo． B. Oxytocin．
C. The gesture． D. The social status．
2.What can we learn from Professor Ryan's previous experiment?
A. Oxytocin affects our behavior in a different way．
B. Our body lets out oxytocin when we are deep in love．
C. Our body produces oxytocin when we feel unhappy about others' success．
D. Oxytocin improves our abilities to understand people's behavior differences．
3.Why did Professor Ryan conduct the recent experiment?
A. To test the effect of oxytocin on the ability to recognize social interactions．
B. To know the differences between friendship and competition．
C. To know people's different abilities to answer questions．
D. To test people's understanding of body language．
4.The author develops the text by______．
A. explaining people's behaviors
B. describing his own experiences
C. distinguishing sexual differences
D. discussing research experiments
高二英语阅读理解中等难度题查看答案及解析
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“Global warming could make humans shorter,” warn scientists who claim to have found evidence that it caused the world's first horses to shrink(收缩) nearly 50 million years ago. In fact, a team from the universities of Florida and Nebraska says it has found a link between the Earth heating up and the size of mammals – horses, in this case.
The scientists used foss
ils to follow the evolution of horses from their earliest appearance 56 million years ago. As temperature went up，their size went down, and vice versa（反之亦然）;“ At one point they were as small as a house cat,” said Dr Jonathan Bloch, curator（博物馆长） of the Florida Museum of Natural History, which was quoted by the "Daily Mail" as saying.The scientists say that the current warming could have the same effect on mammals and could even make humans smaller."Horses started out small, about the size of a small dog . What's surprising is that after they first appeared, they then became even smaller and then dramatically increased in size, and that exactly corresponds to the global warming event, followed by cooling”
"It had been known that mammals were small during that time and that it was warm, but we hadn't realized that temperature specifically was driving the evolution of body size," Dr Bloch said in the "Science" journal.
1.How did scientists find out the horses’ earliest appearance millions of years ago?
A. searching the data on the net
B. sorting through the pictures of ancient times
C. using fossils to follow the evolution
D. analyzing the related images
2.What can we infer form the passage?
A. As temperatures went up, horses dramatically increased in size
B. The temperature has no effect on mammals’ evolution
C. As temperatures went up, horses’ size went down
D. In history, it used to be warm at early times , followed by a certain period of sharply cooling down.
3.Which is the most closest meaning to the underlined words most probably mean _______.
A. react to B. be contradictory to
C. be consistent with D. differ from
4.What is the best title of the passage?
A. Global warming is to disappear
B. The temperature on earth is to decrease
C. Global warming makes human shorter
D. Mammals are dying out.
高二英语阅读理解中等难度题查看答案及解析
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根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Some researchers, parents and teachers have suggested that high-school classes begin later in the morning to accommodate (适应) teens’ needs for more sleep. 1. However, in the meantime you’ll have to make your own adjustments. Here are some suggestions that may help you to sleep better.
Set a regular bedtime. Going to bed at the same time each night signals to your body that it’s time to sleep. 2. So try to stick as closely as you can to your sleep schedule, even on weekends.
Exercise regularly. 3. Finish exercising at least 3 hours before bedtime. Many sleep experts believe that exercising in late afternoon may actually help a person sleep.
Avoid stimulants (刺激物). Don’t drink beverages with caffeine, such as soda and coffee, after 4 pm. 4. And drinking alcohol in the evening can make a person restless and interrupt sleep.
Relax your mind. Avoid violent, scary or action movies or television shows right before bed. Reading books with active plots may also keep you from falling or staying asleep.
Create the right sleeping environment. 5. So close your curtains (and make sure they’re heavy enough to block out light) and turn down the thermostat (恒温器). Noise can prevent people from sleeping well. Use a white-noise machine if you need to block out a noisy environment.
A. Waking up at the same time every day also helps establish sleep patterns.
B. People usually sleep best in a dark cool room.
C. Light signals to the brain that it’s time to wake up.
D. Try not to exercise right before bedtime as it can make it harder for you to fall asleep.
E. Nicotine is also a stimulant, so quitting smoking may help you sleep better.
F. Naps too close to bedtime may keep you from falling asleep.
G. Some schools have carried out later start times.
高二英语七选五中等难度题查看答案及解析
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British researchers have found that children’s IQ predicts their probability of becoming vegetarians (素食者) as young adults.
Recent studies suggest that vegetarianism may be associated with lower cholesterol (胆固醇), reduced risk of overweight and heart disease.
“We know from other studies that brighter children tend to behave in a healthier fashion as adults—they’re less likely to smoke, less likely to be overweight，less likely to have high blood pressure and more likely to take exercise.” lead author Catharine Gale said, “This study provides further evidence that people with a high IQ tend to have a healthier lifestyle.”
In the study, Gale’s team collected data on nearly 8,200 men and women aged 30, whose IQ had been tested when they were 10 years of age.
“Children who scored higher on IQ tests at age 10 were more likely than those who got lower scores to report that they were vegetarian at the age of 30.”Gale said.
The researchers found that 4.5 percent of participants were vegetarians. Of these, 2.5 percent were vegan, and 33.6 percent said they were vegetarian but also ate fish or chicken.
There was no difference in IQ score between strict vegetarians and those who said they were vegetarian but also ate fish or chicken，the researchers added.
One expert said the findings weren’t the whole answer，however.
“We don’t know the beliefs or attitudes of the parents of the children，nor do we know if there was a particular event that led these children to becoming vegetarian in their teens or adulthood.” said Lona Sandon, and assistant professor at the University of Texas Southwestern Medical Center at Dallas.
1.From the article，we know that ________.
A．brighter children are likely to become vegetarians when they are ten.
B．people with a higher IQ will not be overweight
C．brighter children are likely to have a healthier lifestyle
D．overweight may cause high blood pressure
2.What does the underlined word “vegan” in the sixth paragraph mean?
A．Someone who only eats vegetables.
B．Someone who chooses not to eat meat or fish.
C．Someone who likes eating meat and fish.
D．Someone who likes eating vegetables.
3.This study left some unanswered questions EXCEPT “________”．
A．Did the vegetarian children grow up in a family with a vegetarian parent?
B．Did the children eat a primarily vegetarian diet at the age of 10?
C．Were meatless meals regularly served in the participants’ families?
D．Did the vegetarian children really have a high IQ?
4.The main idea of the passage is that ________.
A．the low IQ children will be unhealthier when they grow up
B．being vegetarians can reduce the risk of overweight and heart disease
C．IQ is important to vegetarians
D．high IQ children are more likely to become vegetarian when they grow up
高二英语阅读理解中等难度题查看答案及解析
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An international team of researchers from the University of Oxford have found that the way people use the Internet is closely tied to the seasonal movements in the natural world. Their online species searches follow the patterns of seasonal animal migrations (迁徙).
Migratory birds ( 候 鸟 ) flood back to where they reproduce every spring. That migratory behavior is accompanied by some human behavior. “In English-language Wikipedia ( 维基百科), the online searches for migratory species tend to increase in spring when those birds arrive in the United States,” said the lead author John Mittermeier.
And not just birds. Mittermeier and his team surveyed nearly 2.5 billion Wikipedia search records, for 32,000 species, across 245 languages. They also saw variable search rates for insects, horsetails and flowering plants. Seasonal trends seemed to be widespread in Wikipedia behavior for many species of plants and animals.
This finding suggests new ways to monitor changes in the world’s biological diversity. It also shows new ways to see how much people care about nature, and which species and areas might be the most effective targets for conservation.
Mittermeier is encouraged by the search results. He commented, “I think there’s a concern among conservationists (生态环境保护者) that people are losing touch with the natural world and that they’re not interacting with native species anymore. And so in that sense, it was really exciting and quite unexpected for me to see people’s Wikipedia interest closely related to changes in nature.” Richard Grenyer, Associate Professor from the University of Oxford, says search data is useful to conservation biologists, “By using these big data approaches, we can direct our attention towards the difficult questions in modern conservation: which species and areas are changing, and where are the people who care the most and can do the most to help.”
1.What have researchers found about species searches?
A.They strengthen ties among people. B.They affect the animal movements.
C.They reflect animal migration seasons. D.They differ in language backgrounds.
2.What is the purpose of writing Paragraph 3?
A.To further support the research findings.
B.To show the variety of species searches.
C.To summarize the research process.
D.To present researchers’ heavy work load.
3.How does Mittermeier feel about the search results?
A.Sad about people’s not getting close to nature.
B.Worried about Wikipedia behavior.
C.Amazed at people’s care about nature.
D.Satisfied with Wikipedia’s service.
4.From which is the text probably taken?
A.A scientific magazine. B.A biology textbook.
C.A biography. D.A travel brochure .
高二英语阅读理解困难题查看答案及解析
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Sleep is essential for a person’s wellbeing. Researchers have found that sleep loss increases a person’s risk of developing serious medical conditions. Now, a new study has found that getting enough sleep is also the key to improving academic performance.
Jeffrey Grossman, who led the research, was not trying to find the correlation (相关性) between sleep and grades when he handed out Fitbits to the students in his class. Instead, the professor hoped the popular wrist-worn electronic device (装置), which tracks a person’s activity 24/7, would show a connection between physical exercise and academic achievement.
As part of the research, a quarter of the participants chose a fitness class specially created for the study. After the school term ended, the researchers carefully analysed the data. Much to Grossman’s surprise, they found no measurable difference in test performance between the group that had been physically active and the group that had not.
However, the study presented a surprising viewpoint in the journal Science of Learning. Going through the large amount of data, Grossman noticed an interesting trend (走向) from the participants sleep patterns. There was a straight-line relationship between the average amount of sleep and his/her grade on the exams.
Besides, it was not enough for students to just head to bed early the night before a test. Grossman says: “We’ve heard the phrase ‘Get a good night’s sleep, you’ve got a big day tomorrow.’ It turns out this does not relate at all to test performance. Instead, it’s the sleep you get during the days when learning is happening that matters most.”
The time students went to bed each night was similarly important. Those who went to bed in the early hours of the morning performed poorly, even if the total sleep time was the same as a higher-performing student.
The research does not prove that sleep is the only component that helps improve academic performance. However, Grossman says the results are a strong indication that sleep really matters. Who knew getting A’s just required some extra ZZZ’s?
1.What’s Grossman’s original purpose by using Fitbits in the research?
A.To improve students sleep patterns.
B.To regulate students’ daily behavior.
C.To monitor students’ physical condition.
D.To find effects of physical exercise on grades.
2.What did Grossman think of the research result?
A.It was unexpected. B.It was changeable
C.It was unreliable. D.It was fruitless.
3.What plays a more important part in test performance?
A.Sleep in the learning stage. B.Average amount of sleep during tests.
C.Sleep quality the night before the test. D.A regular bedtime.
4.What is the best title for the text?
A.Be Physically Active and Sleep More
B.Enough Sleep Benefits Our Wellbeing
C.Catch ZZZ’s for Good Test Performance
D.The More Exercise, the Better Schoolwork
高二英语阅读理解困难题查看答案及解析
ils to follow the evolution of horses from their earliest appearance 56 million years ago. As temperature went up，their size went down, and vice versa（反之亦然）;“ At one point they were as small as a house cat,” said Dr Jonathan Bloch, curator（博物馆长） of the Florida Museum of Natural History, which was quoted by the "Daily Mail" as saying.