Taking vitamin pills in high doses(剂量) can significantly increase the risk of cataracts(白内障), a study has shown.
Scientists found that consuming large amounts of vitamin C made individuals 20 percent more likely to develop the condition, which is a leading cause of blindness. And regularly taking high-dose vitamin E tablets increased the chance of cataracts forming by 60 percent. The dangers are even greater for the elderly, with those over 65 nearly doubling their chances of damaging their vision if they took these vitamins every day.
Researchers from the Karolinska Institute in Stockholm monitored 31,000 volunteers aged between 45 and 79. Nearly 3,000 of them went on to need treatment for their eyes. The Swedish team discovered a strong link between those who developed cataracts and those who took high doses of vitamins C and E.
It was originally thought that the two vitamins would protect against cataracts because they are powerful antioxidants(脱氧化剂). It was supposed that they would fight the process of oxidation(氧化), which destroys cells in much the same way as rust(锈) rots a car. However, it it now believed that, in large quantities, vitamin C may actually cause oxidation by upsetting the natural balance of proteins in the eye.
The human body does not make or store vitamin C, and gets its supply from fruit and vegetables. It only needs 40 mg a day to keep cells healthy and promote healing. Vitamin E helps maintain the structure of cells and is found in food items such as nuts and seeds. Aman needs just 4 mg a day and a woman should have 3 mg. But tablets containing up to a hundred times this amount are also available in UK health food shops. Researchers stressed that the dangers will only be caused if the vitamins are taken in very large amounts. These were defined as 1,000 mg of vitamin C and 100 mg of vitamin E a day.
However, Professor Yit Yang, from the Royal College of Ophthalmologists in Australia, said, “It is not possible to establish from this study that vitamin C caused cataracts, as there may be other factors(因素) that were not accounted for.”
1. What do we know about the research from the text?A.The research was conducted in Australia. |
B.The volunteers covered the full range of ages. |
C.Almost 10 percent of the volunteers had something wrong with their eyes. |
D.The research found vitamin C is more likely to cause cataracts than vitamin E. |
A.They could lead to blindness. |
B.They could cause cataracts. |
C.They could increase oxidation. |
D.They could prevent cataracts. |
A.The Side Effects of Vitamins C and E |
B.The Fight Between Vitamins and Oxidation |
C.Does a High Vitamin Intake Equal Cataracts? |
D.Why Are High Doses of Vitamins Bad for Health? |
A.To warn people not to take too many vitamins. |
B.To tell people about a new medical discovery. |
C.To reveal the risks of antioxidants and the like. |
D.To explain the relationship between vitamins and blindness. |
相似题推荐
【推荐1】We’ve all been there. It has been a long day, there is nothing in the fridge, cooking seems arduous and the solution is obvious: takeaway. It’s easy for takeaways to become a regular habit. At some point, you have to wonder: even if you don’t look different in the mirror, is it doing you any harm?
There is some evidence that too many takeaways is linked to weight gain, but the relationship isn’t clear. A 2022 study found a connection between eating takeaway-style food in the 24 hours before taking the survey and increased BMI in participants, although the researchers were careful to point out that they didn’t know whether frequently eating takeaways made people overweight, or whether overweight people frequently eat takeaways. There is, however, evidence that simply living near(or walking past)a takeaway outlet or two can have an impact on body weight, with exposure to outlets near the workplace, most likely to tempt people.
But why? Well, takeaway food tends to be high in fat and salt - ingredients that are relatively cheap and taste good, making you more likely to reorder. There is also some evidence that junk food can be addictive, as the combination of salt, fat and sugar makes it hard to stop eating.
There is also the nutritional quality of the ingredients themselves. “Most takeaways contain highly processed ingredients and additives, nutrient-poor carbohydrates and plenty of deep-fried foods cooked in oil repeatedly heated to high temperatures, says Pearson.
So, what is the message? If you must place that order, consider the options:
The worst offenders on any menu are likely to be fried foods, or anything covered in high-sugar sauces. If you order Chinese food, go for steamed dumplings, grilled fish or soup. If you are going for Indian food, go heavy on the side dishes, like bean and potato curries, which are often more flavourful and healthy.
Finally, try to cut your consumption: consider switching your daily routes, hide the menus, and delete the apps on your phone.
1. What does the underlined word ‘arduous’ in Paragraph 1 probably mean?A.Attractive | B.Troublesome |
C.Confusing | D.Dull |
A.The cause and effect relationship of takeaways and being overweight |
B.Whether there is any connection between takeaways and being overweight |
C.Which ingredients in takeaway food are the most addictive |
D.Whether takeaways near the workplace are more likely to attract people |
A.Hamburgers and fries | B.Indian main courses |
C.Fried noodles | D.Steamed dumplings |
A.Takeaways make you fat |
B.Are takeaways harmful? |
C.How to choose the best takeaway |
D.How to avoid takeaways |
【推荐2】Scenes of comic characters swelling (肿) up after eating peanuts in Western TV shows have long been puzzling for many Chinese viewers, as few people in China meet those who have a severe peanut allergy (过滤反应).
Their confusion can be explained by the results of a new Chinese study. It found that Chinese adults and children are more likely to be allergic to seafood and less likely to be allergic to peanuts, compared to people in Europe and the US. The difference means that cultural, dietary (饮食的) and environmental factors can play an important role in food allergy patterns. The study was published in late August in China CDC Weekly, which was established by the Chinese Center for Disease Control and Prevention.
In another recently published study in China CDC Weekly researchers found that the prevalence (流行) of food allergies in the population was 8 percent from 2009 to 2018, up from 5 percent from 1999 to 2008. It thus indicated that the prevalence of food allergies in China is on the rise.
Luo Xiaoqun, a doctor at Fudan University’s Huashan Hospital, said during an interview with media outlet YXJ.org.cn that the increasing rate of food allergies is a phenomenon observed worldwide, driven by changes in lifestyles and eating habits, as well as growing health awareness and diagnostic (诊断) ability.
For consumers, reading allergen labels (过敏标签) on food packages is an easy way to protect themselves from allergy triggers (诱因).
However, food allergen labeling in China currently is optional and labeling largely follows an international standard that includes eight major food types such as milk, eggs, and fish and shellfish, which may not be suitable for Chinese consumers. “China has made improvements in setting up food labeling standards in recent years, and we hope our findings can accelerate (加速) the process of making such labeling compulsory in the near future,” Chen Hongbing, one of the researchers at Nanchang University, told China Daily.
1. What is the function of writing paragraph 1?A.To introduce food people are commonly allergic to. |
B.To make a comparison between different allergies. |
C.To describe typical allergy symptoms. |
D.To introduce a study about allergies. |
A.Chinese are less likely to have allergies than Westerners |
B.More Chinese suffer from food allergies than before. |
C.Fewer Chinese are allergic to sea food than in 2008. |
D.Allergies are mainly caused by dietary factors. |
A.It cannot be read on all food packages. |
B.It strictly follows and internationals standard. |
C.It shows only eight major food types. |
D.It is not popular with food producers. |
A.Positive. | B.Doubtful. | C.Worried. | D.Indifferent. |
【推荐3】How to Stop Binge Eating (饮食无度)
When it comes to trying to lose weight, stopping binge eating can be very difficult. Maybe you believe that to lose weight, one must go on a diet. Usually, you eat in a certain way until you reach your weight goals.
Get support. Sometimes it's hard to stop if you are doing this all alone. So what you can do is to ask some friends or family members to help remind you.
Limit your access to food.
These tips are just a few things you can do. The important thing to remember is that you need to have the right mindset going into this thing.
A.Try to eat healthily. |
B.Don’t hurt yourself. |
C.This will only cause you to eat even more. |
D.This sort of thinking will cause you to fail. |
E.In other words, it gets easy as time goes by. |
F.It’s hard to eat a lot when you don’t have food to eat. |
G.Usually, we eat more than we want to just out of habit. |
【推荐1】Writing a book is a long and challenging process, but new technology is increasingly making it easier for authors to finish their books.
Michael Green, a US data scientist-turned-novelist, felt that technology could help him simplify the writing process when he was in the middle of writing his debut (首部) book.
He said that the process had become difficult to manage: “In the midst of editing, I got to the point where I started feeling like I had a lot of plots and characters,” he told the BBC.
“I had all these documents on the deeper aspects of the world I was creating. I was worried about being able to keep track of it all. That’s when I switched into my more data science-minded approach to solving a complex problem with a lot of different pieces.”
Green went on to create Lynit, a digital platform to help authors plan and weave together the many elements that form a story, such as themes, characters, and major events.
“As the author gets a new idea that they want to bring into the story, they are able to input it into a natural framework,” he told the BBC. “Piece by piece, they’re adding to the story. As new ideas come in, they change, maybe by creating new nodes (节点) or interactions, new relationships.”
Once the book has been published, technology is also playing an ever-increasing role in publicity and connecting with readers. Websites and apps from specialist firms allow authors to participate in live question-and-answer sessions with their audience.
Another tech firm, Crazy Maple Studios in California, US, offers authors four apps that can add music, animation, sound effects and in some cases, gameplay.
Michael Green believes technology will become even more important as a new generation of tech-savvy (精通技术的) writers becomes more well-known.
“What I’m finding with the Generation Z and even younger writers is that they’re looking for technology to give them guidance,” he told the BBC. “They see it as a tool to learn and grow with, rather than extra work.”
1. What difficulty did Green face in writing his debut book?A.He would leave out important plots. | B.He had trouble organizing his thoughts. |
C.He often felt that he was not creative enough. | D.He was afraid the characters wouldn’t appeal to readers. |
A.It creates new relationships for authors. | B.It can generate images based on words. |
C.It can translate thoughts into sentences. | D.It brings authors closer to their readers. |
A.apps which help them add music, animation, sound effects even gameplay |
B.a digital platform which helps them plan and weave together the elements |
C.a digital platform which helps them participate in creating new nodes |
D.apps which help them organise a lot of plots and characters |
A.Technology adds to the burden of authors. | B.New technology matters to growing authors. |
C.Young writers rely too heavily on technology. | D.New technology gets in the way of creativity. |
A.To give advice on how to write a book. | B.To encourage the use of technology in writing. |
C.To share how new technology benefits authors. | D.To show the popularity of new tools among authors. |
【推荐2】Britain faces social problems as lots of people are set to lose their jobs in technological revolution, Bank of England’s chief economist warned.
Andy Haldane said the so-called Fourth Industrial Revolution will make the machine replace humans to do thinking things. The dark side of the change could be a much bigger breakdown of employment than in Victorian times, with professions such as accountancy (会计) among those at risk.
A report by the accountancy firm PwC last month warned that more than 7 million jobs in Britain had been lost over the next 20 years as technological change sweeps though workplaces.
The majority of these are in jobs in the retail, transport and manufacturing industries. However, other traditional professional sectors could also be at serious risk.
Economists treat the arrival of increasingly intelligent computers and robots as the fourth industrial revolution. The first was the shift from agricultural to urban societies, the second saw the widespread use of electricity and steel, and the third was the digital revolution when computers, the Internet and mobile phones were developed.
Mr Haldane said the hollowing-out (空洞化) experienced in the past years could be on a greater scale in the future so it is important to learn the lessons of history and ensure that people are given training to take advantage of new opportunities.
“Jobs were effectively taken by machines of various types, there was a hollowing-out of the jobs market, which left many people for a long period out of work and struggling to make a living,” Haldane added, “That heightened social and financial tensions, and led to a rise in inequality. This is the dark side of technological revolution.”
“That hollowing-out is going to be potentially on a much greater scale in the future, when we have machines thinking and doing the cognitive and technical skills of humans.” Mr Haldane said professions like accountancy could be among those hardest hit by the rise of AI. But he suggested economists could escape.
1. What is the dark side mentioned in the text?A.The hollowing-out has become a major social problem. |
B.Less and less people have the desire to learn accountancy |
C.Intelligent computers and robots decrease good workers. |
D.The technological revolution causes people to lose jobs. |
A.The study about economy is at a low level. |
B.Economists work on a traditional professional job. |
C.There is no machine that can work as an economist. |
D.Economists have the chance to avoid technological revolution. |
A.To call for people to devote more to studying history. |
B.To teach people to grasp the chances technological revolution brings about. |
C.To warn people not to work on transport and manufacturing industries. |
D.To ask workers to develop and think as the intelligent computers and robots do. |
A.Positive. | B.Aggressive. |
C.Critical. | D.Worried. |
【推荐3】When the world responded to the COVID-19 epidemic with broad lockdown orders, home delivery services lacked the manpower to keep up with the explosion in demand. Stores and companies went on doing the hiring; in some areas, it was very hard to get goods delivered.
You know what might have made things a bit easier? Drones. It has taken years for the Federal Aviation Administration (FAA) to allow the use of unmanned aerial devices for commercial delivery. Over the course of a decade, we've gone from a complete ban to slow, heavily regulated, and restricted initial testing.
At the end of August 2020, the FAA finally gave Amazon approval for its Prime Air drone delivery fleet. It did that by classifying Amazon as an "air carrier" and making it obey some relatively recent regulations intended to facilitate drone deliveries.
The FAA's rules initially required that private drones remain in sight of the operator at all times. That simply won't work for delivery services. So in 2019, the agency introduced a special certification process that would allow approved pilots to operate drones across much longer distances.
Amazon will now be able to join Google in drone deliveries. The company revealed that its fleet can carry packages weighing up to 5 pounds and deliver them within a 15-mile range in less than 30 minutes. The FAA also recently granted the company Zipline, a temporary waiver allowing it to deliver medical supplies in North Carolina. Zipline had been operating for some time in Africa. But the United States continues to fall behind both developed and developing nations in giving drone companies the freedom to test their services.
While Amazon still faces several technical problems and strict regulations, it's great that the government is giving it this new room to move. Too bad it took the feds this long to allow it, especially as the pandemic made drone deliveries not just an innovation, but something we could have used yesterday.
1. What can be inferred from Paragraph 2?A.Drones are the most convenient aerial devices. |
B.The use of drones was completely banned at first. |
C.It took a short time to allow the use of drones. |
D.FAA allows drones to serve for the army. |
A.Home delivery services were in great demand because of the COVID-19 epidemic. |
B.Rules for private drones also works for delivery services. |
C.Amazon's pilots were allowed to operate drones across much longer distances until 2020. |
D.America took the lead in giving drone companies the freedom to test their services. |
A.The companies allowed to use drone delivery. | B.Amazon joining in drone deliveries. |
C.Drone deliveries used in medical service. | D.Zipline operating in Africa and America. |
A.Neutral. | B.Negative. | C.Favorable. | D.Indifferent. |
【推荐1】Florida wildlife officials say manatees (海牛) facing starvation are benefitting from a program that feeds them on tons of donated lettuce (生菜). The program aims to save as many of the large animals as possible as water pollution has led to shortages of their favorite food, seagrass.
The effort has provided the manatees with more than 25 tons of lettuce. The feedings usually draw about 300 to 350 manatees per day. Sometimes, there are as many as 800 manatees. Normally, wildlife experts advise against people feeding wild animals. This is because it can lead the animals to make an unhealthy connection between humans and food. It is a crime in Florida for a person to feed manatees on their own, even though officials say many people want to do so. Experts believe the best way people can help is to donate money through an official institution (机构).
In 2021, 1101 manatee deaths were reported, largely from starvation. The normal five-year average is about 625 deaths. State wildlife officials say that so far this year, 164 manatee deaths have been recorded. Tom Reinert, the local director of state’s Fish and Wildlife Conservation Commission, said the feeding program has helped to reduce the rising death rates. Officials estimate there are about 8,800 manatees in Florida waters. That is a big improvement from about 2,000 that existed in the 1990s. The increased numbers were responsible for manatees being removed from the endangered species list.
The most important element for supporting the remaining population will be restoring seagrass beds. So far, Florida has set aside $8 million to deal with that problem. “You can’t just go out and plant a bunch of seagrass,” Reinert said. But he added, “Projects are getting started and are in the planning stages.”
1. What is the program intended to do?A.To reduce food waste. | B.To study manatees’ eating habits. |
C.To rescue large animals from starvation. | D.To solve the problem of water pollution. |
A.Feed healthy food to them. | B.Set up special rescue groups. |
C.Pay more visits to wildlife reserves. | D.Offer financial aid to official organizations. |
A.Impractical. | B.Significant. |
C.Complicated. | D.Time-consuming. |
A.Manatee Saving Program | B.Ocean Protecting Program |
C.Manatee Feeding Program | D.Seagrass Beds Restoring Program |
【推荐2】Some people think that success is only for those with talent or those who grow up in the right family, and others believe that success mostly comes down to luck. I’m not going to say luck, talent, and circumstances don’t come into play because they do. Some people are born into the right family while others are born with great intelligence, and that’s just the reality of how life is.
However, to succeed in life, one first needs to set a goal and then gradually make it more practical. And, in addition to that, in order to get really good at something, one needs to spend at least 10,000 hours studying and practicing. To become great at certain things, it’ll require even more time, time that most people won’t put in.
This is a big reason why many successful people advise you to do something you love. If you don’t enjoy what you do, it is going to feel like unbearable pain and will likely make you quit well before you ever become good at it.
When you see people exhibiting some great skills or having achieved great success, you know that they have put in a huge part of their life to get there at a huge cost. It’s sometimes easy to think they got lucky or they were born with some rare talent, but thinking that way does you no good, and there’s a huge chance that you’re wrong anyway.
Whatever you do, if you want to become great at it, you need to work day in and day out, almost to the point of addiction, and over a long period of time. If you’re not willing to put in the time and work, don’t expect to receive any rewards. Consistent, hard work won’t guarantee you the level of success you may want, but it will guarantee that you will become really good at whatever it is you put all that work into.
1. Paragraph 1 mainly talks about ________.A.the reasons for success |
B.the meaning of success |
C.the standards of success |
D.the importance of success |
A.being good at something |
B.setting a practical goal |
C.putting in more time |
D.succeeding in life |
A.work makes one feel pain |
B.one tends to enjoy his work |
C.one gives up his work easily |
D.it takes a lot of time to succeed |
A.Having a goal is vital to success. |
B.Being good is different from being great. |
C.One cannot succeed without time and practice. |
D.Luck, talent and family help to achieve success. |
【推荐3】Bob and Sue Harvey spent nine years as resident fellows in a dormitory at Sanford and in their book Virtual Reality and The College Freshman, they write “The Freshman often faces an identity problem during the first semester.” College is a more pressured environment than it used to be, in part because the academic gap between high school and college has increased. Many college freshmen have never had to make independent decisions about sex, drugs and alcohol. Most don’t know how to manage their time or money. They often feel lonely and overwhelmed, resulting in anxiety and depression.
Nancy Corbin, director of clinical service for student-counseling (咨询) services at Iowa State University, says her office is seeing a significant increase in requests for counseling from freshmen who are having trouble making the adjustment to college life. She says older teenagers increasingly lack the skills to deal with personal problems that aren’t easily defined or fixed. And they get homesick but have a hard time admitting it.
Parents and high schools can make things easier on freshmen by preparing them differently. For example, by teaching them to budget their hours and dollars. The Harveys think high schools should offer a college-life course. “Parents need to focus more on relationship and personal issues and less on how many sheets and towels to take,” they say. Many homesick freshmen think they’ll be regarded as failures if they come home before Thanksgiving. So parents can help by letting them know they’re welcome to return if they feel the need. In the meantime, parents have to find new ways to keep in touch with their college kids. One of the best ways is e-mail. It’s less unpleasant and less expensive than constant phone calls and is more likely to be answered than a handwritten letter.
1. Why is the first semester difficult for freshmen in college?A.Because they often fail in exams. |
B.Because they lack time and money. |
C.Because they are too homesick to make new friends. |
D.Because they have to settle personal issues on their own. |
A.parents should stop buying anything for their kids |
B.parents should develop a good relationship with their kids |
C.parents should be taught how to send e-mails to their kids |
D.parents should work with high schools in college-life courses |
A.Hard Life of College Freshmen | B.Approaches to Trouble in College |
C.Freshmen’s Adaptation Problems | D.A Strange Phenomenon in College |