Researchers in the United States say eating less can slow the aging process of cells in the body. The researchers studied mice, not people.
1. One group was able to eat as much as it wanted. The other animals in the other group were limited to eat. Their diet had 35 percent fewer calories than the first group of mice.
The mice with the diet restrictions (限制) were more energetic and suffered fewer diseases. They were not just living longer, they seemed to stay younger for a longer period of time. When you restrict calories (in mice), there is a direct increase in lifespan—the average age of the animal.2.
But how? The researchers found that fewer calories slow down a natural mechanism in cells called ribosomes (核糖体). Ribosomes are responsible for making important proteins in the cells. But with fewer calories, they slow down.3. This, in turn, keeps cells and the entire body functioning well.
Earlier studies have suggested a link between calorie restrictions and slowed aging.4.
Calorie restriction as a way to slow aging has not been tested in humans. But the main finding for people is the importance of taking care of our bodies.5. And this may help us make better decisions about what we eat.
A. The less we eat, the healthier we are.
B. Researchers studied two groups of mice.C. This finding is good news if you are a mouse.
D. This gives the cells more time to repair themselves.
E. The findings help to explain how exactly our bodies age.
F. However, this is first to show how the ribosomes can influence aging.
G. Calorie restriction caused real biochemical changes that slowed down the rate of aging.
高三英语七选五中等难度题
Researchers in the United States say eating less can slow the aging process of cells in the body. The researchers studied mice, not people.
1. One group was able to eat as much as it wanted. The other animals in the other group were limited to eat. Their diet had 35 percent fewer calories than the first group of mice.
The mice with the diet restrictions (限制) were more energetic and suffered fewer diseases. They were not just living longer, they seemed to stay younger for a longer period of time. When you restrict calories (in mice), there is a direct increase in lifespan—the average age of the animal.2.
But how? The researchers found that fewer calories slow down a natural mechanism in cells called ribosomes (核糖体). Ribosomes are responsible for making important proteins in the cells. But with fewer calories, they slow down.3. This, in turn, keeps cells and the entire body functioning well.
Earlier studies have suggested a link between calorie restrictions and slowed aging.4.
Calorie restriction as a way to slow aging has not been tested in humans. But the main finding for people is the importance of taking care of our bodies.5. And this may help us make better decisions about what we eat.
A. The less we eat, the healthier we are.
B. Researchers studied two groups of mice.C. This finding is good news if you are a mouse.
D. This gives the cells more time to repair themselves.
E. The findings help to explain how exactly our bodies age.
F. However, this is first to show how the ribosomes can influence aging.
G. Calorie restriction caused real biochemical changes that slowed down the rate of aging.
高三英语七选五中等难度题查看答案及解析
Children in the United States eat too much pizza that some researchers now argue the food should join the ranks of sugary drinks and fast food for the harm they do to health．
In a new study, the researchers found that pizza is a large source of calories, saturated fat(饱和脂肪)and salt in children’s diets．Children should not eat more than two slices of pizza for a meal．and should pair that with salad, rather than with another high-calorie food，the researchers concluded．
“Parents should aim to control pizza consumption(消费), particularly as a snack where it was shown to have a very adverse impact on children, and they should put their pizza dollars toward healthier brands．” said Lisa Powel, director of the Illinois Prevention Research Center．
Pizza has become a matter of focus in recent years for researchers who look at the meals children eat, rather than the nutrients within them．Studies have found pizza is among the greatest sources of calories for children．
“Since pizza remains a common part of children’s diet, we need to make ‘healthy’ pizza．”Powel said．To make pizza healthier, food producers should reduce its saturated fat and salt, and increase its whole grain content，she said．
Whether or not pizza is harmful enough to be picked out as an unhealthy food, the study attracts attention to a larger issue with the modern American lifestyle, said Alexis Tindall, who was not involved in the flow research．Many foods arc eaten too frequently and in large sizes．said Tindall．To solve the problem, people don’t have to give up eating pizza, but instead, they can eat smaller and healthier pizza，she said．
“Make it at home, instead of ordering it out where you don’t have any control over how it’s made．”Tindall said. “When we make it at home, we can choose healthier ingredients，increase the vegetables．reduce fat, and put in less cheese．Pizza doesn’t have to be just pepperoni(意大利辣香肠)and cheese．”
1.According to the research．children shouldn’t eat ．
A．more than two slices of pizza in a day
B．two slices of pizza for a meal
C．more pizza with French fries
D．pizza along with salad
2.Powel suggests healthier pizza should be made ．
A．with less salt B．with more ingredients
C．in smaller sizes D．at home
3.The last sentence of the passage implies that pepperoni and cheese ．
A．are not necessary ingredients of pizza
B．should be reduced by adding healthier ingredients．
C．should all be replaced with healthier ingredient．
D．are not the only healthy ingredients of pizza
4.What is the best title for the passage?
A．Pizza—a real junk food!
B．How to prepare better meals for your kids?
C．Bring in healthier pizza for Americans
D．Discover the harm of eating pizza
高三英语阅读理解中等难度题查看答案及解析
Researchers in the United States have developed the first wirelessly controlled device that can supply a drug directly into the body. A small chip is implanted (植入) under the skin. It contains the medicine, which it releases at preset times. The developers say the device could improve the lives of millions of people who take medicine for long-term illnesses. A company called Microchips began developing the device about fifteen years ago. Last month, the company released the results of its first successful tests in humans. The tests took place in Denmark with seven women with osteoporosis（骨质疏松症）.
Osteoporosis causes bones to become weak and break easily. The disorder is common among older people especially women. Many patients have to give themselves daily injection（注射）of medicine. One type of treatment requires injections for two years. The patients stop taking the medicine because of the pain and stress of the injections. As a result, only twenty-five percent of the patients will go through the entire twenty-four months of treatment.
The microchip is a few centimeters long. It has small sections and each section holds a single dose（单次剂量）of medicine. The device has to be programmed with the times to release the drug. Doctors will be able to reprogram the device from a computer or even a cell phone.
For osteoporosis, the physician will program the device, and the device has the ability to release a dose at a given time, every single day. For other diseases, where the physician may want to change the dosing schedule, they will have the ability to wirelessly reprogram that dosing schedule.
The seven women in the study were ages of sixty-five to seventy. The researchers say the implants were just as effective as daily injections. And they say the medicine amounts were more exact than patients often give themselves.
1.The best title for the passage should be ______.
A．A New Company Called Microchips
B．A New Way to Take Medicine Every Day
C．Good News for Women with Osteoporosis
D．Taking Medicine, with Microchip under Skin
2.What does the underlined word “released” in paragraph 1 mean?
A．Announced. B．Planned. C．Got rid of. D．Caught hold of.
3.We can learn from Paragraph 2 that ______.
A．older people especially men easily develop steoporosis
B．bones’ becoming weak and breaking easily causes steoporosis
C．a quarter of the patients will go through the entire two years of treatment
D．pain and stress of the injections lead all patients to stop taking medicine
4.What advantages does the microchip have?
a. effective implants
b. less exact medicine amounts
c. purposely—changed dosing schedule
d. only one centimeter long and having small sections
e. improving the lives of millions of people
A．a, b, c B．c, d, e C．a, c, e D．b, c, d
5.In which column of a newspaper could we find this passage?
A．Arts. B．Jobs. C．Sports. D．Medicine.
高三英语阅读理解中等难度题查看答案及解析
With more large solar farms being developed in the sunny southwestern United States, researchers and conservationists alike are beginning to notice surprising environmental effects. While solar energy is known for its positive environmental impacts, officials at the National Fish and Wildlife Forensics Laboratory have come to recognize one of its significant downsides: Some specks of birds that live close to large solar plants (太阳能板) are dying off, including endangered birds.
A recent federal investigation recovered 233 birds that had been killed as a direct result of solar plants. Researchers believe that some of the affected birds have mistaken the large, reflective areas of the solar panels for bodies of water. This is a phenomenon referred to by scientists as “lake effect.” The birds are drawn to what they assume to be water. They aim for the area and slam into the panels with great force. It is thought that the insects that birds cat fall victim to “lake effect” as well, leading the birds into the panels.
Researchers figure that between 1,000 and 28,000 birds are killed as a result of harvesting solar energy. The number of birds affected by wind farming is much greater, ranging from 140,000 to 328,000. Coal-fired electricity has the largest negative effect on birds, killing nearly 8 million a year. These numbers make solar farming seem like the best option. However, conservationists are quick to point out that areas where solar is expected to boom between 2015 and 2020 are home to some of the rarest birds in the United States. This could put specific bird species at risk of extinction.
There exists a state order in California that 20 percent of all electricity of all energy sold should be renewable by the year 2017. This has been one driving force behind the rapid development of huge solar farms. The industry, which is expected to boom as a result of this change to renewable energy, is facing newly filed lawsuits (起诉) by conservationist groups. These lawsuits could slow down the approval process for the planned solar development across the Southwest.
1.What can we infer from paragraph 1?
A. Solar farms require a long development period.
B. Most people would be shocked by the size of solar farms.
C. Solar energy equipment looks strange to most people.
D. Most people think that solar energy is very beneficial.
2.The underlined word “slam” in paragraph 2 is closest in meaning to .
A. dash B. break
C. move D. slide
3.Which of the following best reflects the author’s viewpoint?
A. Using solar farms is the most practical way to create energy.
B. More birds are endangered by solar farms than wind farming.
C. Solar farms may not be as friendly to the environment as expected.
D. Ways should be found to reduce “lake effect” caused by solar farms.
高三英语阅读理解中等难度题查看答案及解析
May the first is an important date in the college admission process in the United States. This is the last day for high school seniors to accept or reject offers of admission in the fall. But according to a recent report, there is a great change. Acceptance rates at the top colleges this year were lower than ever.1.
These days, college applicants are applying to more colleges because online and common applications make the process easier.2. On the other hand, deciding students for top colleges to accept can be difficult because it takes much time. Students may not like being put on waiting lists. Also, common colleges work more to get the students they accept to accept them. Some colleges hold visiting days that offer a chance to attend classes and stay overnight. Some universities send gifts.3. .
For many families, the most important thing colleges can do is to show them the money, especially this year; the weak economy makes parents nervous.4. . The recent problems that spread from the housing market to credit markets have even affected student’s loans. So lately, top schools have to spare lots of money to increase their financial aid for students.
5. . The Education Department expects the number of high school graduates to start to go down. This will happen as the last of the children of the baby boom generation finishes high school. The number is not expected to start rising again until 2015.
A. Besides, top colleges are facing changes in the population.
B. What contributes to it?
C. But a mistake can be costly if it happens.
D. But top colleges ignore them.
E. They have international students who know English.
F. It can mean several acceptances to choose from.
G. They cannot afford college as planned.
高三英语信息匹配困难题查看答案及解析
Scientists in the United States say plant life has increased on Earth in the past twenty years and that in every area of plant growth the increase is the result of weather conditions.
Eight scientists from across the United States did the study. The space agency NASA and the Department of Energy paid for it. The findings were published in the magazine Science.
The researchers spent one and a half years examining weather satellite information. The information was recorded from 1982 to 1999. That period was one of the warmest on record. Researchers found that rainfall generally increased during that time.
The satellites measured the number of leaves on plants and the amount of sunlight taken in. The scientists used that information to estimate what is called net primary production. This is total amount of carbon stored in land plants.
The scientists report a 6% increase in stored carbon since 1982. They say gains were high in equatorial areas, especially around the Amazon River in South America. The area alone had a 1% increase in the net primary production.
Ramakrishna Nemani of the University of Montana in Missoula headed the study. He says reduced cloud cover led to growth in Amazon area. He also says the lack of clouds allowed more sunlight to get through. More sunlight meant increases in photosynthesis(光合作用). That is the process by which plants use energy from sunlight to produce the chemicals they need to grow.
Northern Canada, the north-central United States and northern Europe were second in increased plant growth. Ramakrishna Nemani says a rise in temperature helped plants there.
All together, the report says 25% of areas of plant life on Earth experienced increases. But the scientists also note increase in the number of people on Earth and carbon dioxide levels in the atmosphere. Ranga Myneni of Boston University in Massachusetts, another study scientist says humans use about half the net primary production on Earth. And he notes that the world population grew by 36% during the period of time studied.
1.Which of the following is in charge of the study?
A. The space agency NASA of the US.
B. The Department of Energy of the US.
C. Ramakrishna Nemani in Missoula.
D. Ranga Myneni in Massachusetts.
2.What’s the main cause of the plant growth put forward by the study?
A. Growth in population.
B. Regional features.
C. Seasonal variation.
D. Weather conditions
3. Why do scientists believe that reduced cloud cover has led to the plant growth in the Amazon area?
A. Because plants could take in more sunlight.
B. Because plants could get more rainfall.
C. Because plants could enjoy cooler air.
D. Because plants suffer less from natural disasters.
4. Which of the following descriptions about the years from 1982 to 1999 is TRUE?
A. It was the warmest on record.
B. Rainfall decreased little by little.
C. World population grew by 25%.
D. Stored carbon increased by 6%.
高三英语阅读理解简单题查看答案及解析
More and more people, especially in developed countries, arc becoming older. In the United States there are currently over 40 million people aged 65 and over, more than 10 million are over 85. Caring for these senior citizens is becoming a necessity, and a big industry.
Traditionally, care for the elderly has taken place in an extended family, where grandparents live at home and are helped by other family members. However, as more and more young people enter the work force full time they cannot care for their parents or grandparents any more. There are more than 10,000 organizations that provide care for the elderly. More than 1,000 were founded last year alone. Ordinary people quit their jobs and start private care centers, where they offer senior citizens their services.
One of the most difficult aspects of such an organization is finding the right people to do the job. Caring for the elderly is not an easy task. It requires skill and patience. Among daily tasks are preparing meals, washing older people, or simply keeping them company. Many care workers quit because they find it very depressing(令人沮丧的). It is important to help the elderly stay mobile as long as possible. When they cannot walk or climb stairs they need more help: thus costs become higher. Care workers concentrate on exercises to help them stay mobile. In many cases assisted living replaces round-the-clock health care. Elderly people need help with some daily tasks but can mostly live on their own. It also costs less than full nursing care.
While wealthy Americans turn to private care centers, those who are poorer cannot pay for the services because Medicare does not cover it. Not all countries offer health care provided by the state. In Asia and Africa, for example, older people are cared for by family members.
1.Why are more and more private care centers started?
A. Many people can't find other jobs. B. Caring for the elderly is an easy task.
C. Many young people take full time jobs. D. Care workers can get well paid.
2.Who pays for the service in the care center?
A. Medicare. B. The state. C. The family. D. Care centers.
3.What is the third paragraph in the text mainly about?
A. Reasons to start a care center. B. Skills that care workers need.
C. Costs for nursing care. D. Difficulties in running a care centre.
4.How many daily tasks for nursing care are mentioned in the text?
A. Three. B. Four. C. Five. D. Six.
高三英语阅读理解中等难度题查看答案及解析
____ in the United States, St Louis has now become the 4th largest city.
A. It is the 24th biggest city
B. It was the 24th biggest city
C. Before the 24th biggest city
D. Once the 24th biggest city
高三英语单项填空中等难度题查看答案及解析
Market analysts in the United States have recently been quoted as saying that the biggest threat to the luxury (奢侈品) industry in the US is the tech industry. This is according to an article by fellow journalist Ashley Lutz. Her suggestion is sound. The main idea of her article is that products from Tiffany & Co. find their biggest competition not from other luxury brands but from companies like Apple. Lutz points out that luxury products are often only for “show,” while the attraction behind tech products is functionality.
You find few people in the United States today willing to purchase luxury goods at full price. It didn’t use to be that way. Luxury goods used to be actually exclusive. That meant you needed to travel to the right store to purchase them, and you didn’t even have the option of getting a deal.
Today, no one wants to pay full price for luxury goods. People have the unfortunate belief that fakes (赝品) somehow are equal to originals, and if you can’t get a deal on eBay, Amazon, or in an outlet store, purchasing a luxury product probably isn’t worth it. Luxury brands struggle to remain high-end (高档的) images despite the reality that the American consumer is motivated much more by discounts than they are by brand names or image.
Yet people stand in line to pay full price for a new product from Apple and crowds gather to hear about a new smart phone. While electronics are updating every day, people are purchasing technology at full prices much more than they are purchasing luxury goods. What are high-tech makers doing right that luxury makers are pitifully failing at?
Carefully looking at the situation, it would appear as if the Internet didn’t hurt the luxury industry, expectation from the consumers did. What people want these days more than anything is stuff that does something. They want cars that drive, shoes that are comfortable, games that are fun to play, screens that are beautiful to look at, tools that are useful, and entertainment that is entertaining. Little of that fits into what the luxury industry has typically offered with its status, image, and fine materials. The sad reality is that luxury products aren’t that luxury any more.
1.What does this passage mainly talk about?
A. Nobody likes luxury goods any more.
B. Luxury goods are of poor quality nowadays.
C. Tech products become the new “luxury goods”.
D. Iphones have taken the place of luxury products.
2.The underlined word “exclusive” in paragraph 2 means _______.
A. unique and with no bargain B. low in price
C. hard to find D. easy to sell
3.From paragraph 3 we can know that _______.
A. people have found that some luxury goods are fakes
B. people can buy luxury goods at a low price on eBay
C. luxury brands will give up high-end images
D. consumers prefer brand names to discounts
4.What do people pay most attention to nowadays?
A. The Internet service. B. The images of luxuries.
C. The function of products. D. The expectation from the consumers.
高三英语阅读理解中等难度题查看答案及解析
Market analysts in the United States have recently been quoted as saying that the biggest threat to the luxury (奢侈品) industry in the US is the tech industry. This is according to an article by fellow journalist Ashley Lutz. Her suggestion is sound. The main idea of her article is that products from Tiffany & Co. find their biggest competition not from other luxury brands but from companies like Apple. Lutz points out that luxury products are often only for “show,” while the attraction behind tech products is functionality.
You find few people in the United States today willing to purchase luxury goods at full price. It didn’t use to be that way. Luxury goods used to be actually exclusive. That meant you needed to travel to the right store to purchase them, and you didn’t even have the option of getting a deal.
Today, no one wants to pay full price for luxury goods. People have the unfortunate belief that fakes (赝品) somehow are equal to originals, and if you can’t get a deal on eBay, Amazon, or in an outlet store, purchasing a luxury product probably isn’t worth it. Luxury brands struggle to remain high-end (高档的) images despite the reality that the American consumer is motivated much more by discounts than they are by brand names or image.
Yet people stand in line to pay full price for a new product from Apple and crowds gather to hear about a new smart phone. While electronics are updating every day, people are purchasing technology at full prices much more than they are purchasing luxury goods. What are high-tech makers doing right that luxury makers are pitifully failing at?
Carefully looking at the situation, it would appear as if the Internet didn’t hurt the luxury industry, expectation from the consumers did. What people want these days more than anything is stuff that does something. They want cars that drive, shoes that are comfortable, games that are fun to play, screens that are beautiful to look at, tools that are useful, and entertainment that is entertaining. Little of that fits into what the luxury industry has typically offered with its status, image, and fine materials. The sad reality is that luxury products aren’t that luxury any more.
1.What does this passage mainly talk about?
A. Nobody likes luxury goods any more.
B. Luxury goods are of poor quality nowadays.
C. Tech products become the new “luxury goods”.
D. Iphones have taken the place of luxury products.
2.The underlined word “exclusive” in paragraph 2 means _______.
A. unique and with no bargain B. low in price
C. hard to find D. easy to sell
3.From paragraph 3 we can know that _______.
A. people have found that some luxury goods are fakes
B. people can buy luxury goods at a low price on eBay
C. luxury brands will give up high-end images
D. consumers prefer brand names to discounts
高三英语阅读理解中等难度题查看答案及解析