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题型:阅读理解-阅读单选 难度:0.65 引用次数:287 题号:6716769

If you are taking vitamin supplements to reduce your risk of heart disease or cancer, a group of health experts want you to know that those vitamins may actually increase your risk of cancer.

The US Preventive Services Task Force came to this conclusion after reviewing dozens of studies.

Nearly half of adults in the US take at least one vitamin or mineral supplement on a regular basis. These pills are advertised as a way to promote general health. In some cases, manufacturers promote them as cancer fighters and heart protectors.

Studies in animals and in laboratory dishes suggest that oxidative (氧化性的) stress contributes to diseases like cancer and heart disease. If so, there is a reason to believe that antioxidants — including beta-carotene, vitamins A, C, and E — could be useful as preventive medicines.

But when the Task Force examined the medical evidence on vitamins, it found “inadequate (不充分的) evidence” to support the claims that vitamin and mineral supplements benefit healthy adults.

“Cardiovascular (心血管的) disease and cancer have a significant health impact in America, and we all want to find ways to prevent these diseases,” Dr. Virginia Moyer, who heads the Task Force, said in a statement. But so far, she added, the medical evidence does not show that taking vitamins is helpful in this regard.

However, the Task Force did find “adequate evidence” that people with a raised risk for lung cancer actually increase their risk further by taking beta-carotene, a precursor of vitamin A.

The Task Force recommendations of taking vitamins regularly apply to healthy adults aged 50 and older who don’t have “special nutritional needs”. The advice does not apply to children, women who are pregnant or may become pregnant, people with chronic illnesses, or people who have to take supplements because they can’t get all their essential nutrients from their diet.

1. Studies in animals and in laboratory dishes find out________.
A.ample evidence that taking vitamins are helpful for treating lung cancer
B.cardiovascular disease spreads very fast in America
C.oxidative stress can lead to heart disease and cancer
D.people must take vitamins on a regular basis
2. What can we conclude from Task Force’s findings?
A.Scientists want to control cardiovascular disease.
B.In some regard, taking vitamins is not useful.
C.Manufacturers cannot produce medical-use vitamins.
D.Vitamins must be useful to prevent cancer and heart disease.
3. Who can take vitamins regularly according to the advice of the Task Force?
A.A 60-year-old healthy worker.
B.A 15-year-old boy with short-sightedness.
C.A 34-year-old pregnant lady.
D.A 40-year-old man who never eats vegetables or fruits.
4. What’s the best title for the text?
A.An Inside Look at Vitamins
B.Task Force: Ending to Vitamins
C.Vitamins: To Live or to Kill
D.Taking Vitamins to Prevent Cancer May Fail

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【推荐1】When he moved from South Africa to New York City, Norman Rosenthal noticed he felt more depressed during the cold, short days of the city’s winters than he had in his home country.

“It was an illness hiding in plain sight because people said ‘well, that’s how everyone feels in winter.’ They didn’t see it as treatable,” says Rosenthal, a world-famous researcher at Georgetown Medical School. In 1984, he published the first paper to scientifically name the winter blues-Seasonal affective disorder (SAD), also called seasonal depression. It was a type of depression brought on by the dark days of winter.

Mental health experts say there are solutions to treat SAD. The first treatment that may have longer lasting benefits is Cognitive Behavioral Therapy (CBT), a form of talk treatment that Rohan, a heath expert recommends for treating SAD. “Negative (消极的) thinking will produce negative emotions, and we want to change those into slightly less negative, more neutral (中立的) thoughts,” she says of the CBT approach. For example, “I hate winter.” might be replaced as “Winter isn’t my favorite season, but I still find things to enjoy.”

Finding wintertime hobbies may also help. “People with SAD often have hobbies and interests that are summer specific-growing gardens, beach going,” Rohan says. Instead of hibernating (冬眠) under a blanket, she suggests those people find indoor hobbies to enjoy-knitting, joining a book club or going to the gym. Exercising, learning ways to manage stress or planning a sunny vacation during the winter can all help to improve your mood.

Rosenthal stresses that there’s no reason to not seek mind health treatment, even if symptoms (症状) are only present for a few months out of the year.

1. What can be inferred about Norman Rosenthal?
A.He is the first to describe SAD.
B.He was suffering from SAD in 1984.
C.His paper about SAD is on his own experience.
D.His life in South Africa contributes to SAD research.
2. What does the first solution intend to do?
A.Make people follow their heart.
B.Improve people’s talking skills.
C.Help people change negative thinking.
D.Get rid of people’s wrong idea of SAD.
3. What do we learn from paragraph 4?
A.People with SAD don’t grow gardens.
B.Lifestyle changes are useful for mind health.
C.Managing stress depends on people’s preference.
D.Winter is a good time to improve people’s mood.
2023-04-27更新 | 47次组卷
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【推荐2】More than 135,000 UK drinkers will die from cancer caused by alcohol(酒精)by the year 2035, researchers say. Drinking too much will cause 7,100 cancer deaths a year by 2035, a rise of 13 percent on the present rate. A study by Sheffield University and Cancer Research UK shows that alcohol will cost the NHS(National Health Service) £53billion over the next ten years including £2 billion on cancer.

Although alcohol is known to cause many types of cancer including breast and throat most people don’t realize the relation between alcohol and cancer. A survey of 2,100 Britons by the researchers earlier this year found nine in ten did not associate drinking with cancer. The researchers used a computer model to work out the numbers of alcohol-related cancer deaths, hospital admissions(入院)and total costs to NHS over the next 20 years.

The study shows that a fifth of men and 1 in 10 women have alcohol every day---and many of these are middle-aged and middle class. Researchers are very worried about this group as they believe cancer may be caused by drinking over long periods. The study shows that even if the expense stays as it is, alcohol-related cancer deaths will rise from 6,299 in 2015 to 7,097 in 2034. Alcohol will lead to 891, 299 hospital admissions, up from 802, 118 in 2015, and 65, 005 will be caused by cancer.

Earlier this year Chief Medical Officer Dame Sally Davies studied carefully the alcohol guidelines(指导方针)for the first time in thirty years. She told people there was no safe level of drinking and advised them to drink no more than 14 units a week. But researchers say this guidance isn’t enough and want the government to increase a little price per unit of alcohol.

1. What can we learn from the text?
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C.More and more people will get rid of the habit of drinking
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2. What does the underlined word “associate” in Paragraph 2 probably mean?
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D.provide fund for National Health Service
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【推荐3】Sleep disturbances can be an early sign of Alzheimer’s disease (阿尔茨海默病). Many people eventually diagnosed (诊断) with Alzheimer’s start experiencing difficulty falling and staying asleep years before cognitive problems such as memory loss and confusion appear. It’s a vicious cycle: Alzheimer’s disease involves changes to the brain that interrupt sleep, and poor sleep accelerates harmful changes to the brain.

Researchers at Washington University School of Medicine in St. Louis have identified a possible way to help break that cycle. A small, two-night study has shown that people who took a sleeping pill before bed experienced a drop in the levels of key Alzheimer’s proteins — it’s a good sign, since higher levels of such proteins coexist with more serious disease.

The study, which involved a sleeping aid that is already approved by the Food and Drug Administration (FDA) for insomnia (失眠), indicates the potential of this sleeping pill to slow or stop the progression of Alzheimer’s disease, although much more work is needed to confirm the practice of such an approach.

“This is a small, proof-of-concept study. It would be premature for people who are worried about developing Alzheimer’s to interpret it as a reason to start taking this sleeping pill,” said researcher Brendan Lucey, director of Washington University’s Sleep Medicine Center. “We don’t yet know whether long-term use is effective in delaying cognitive decline, and if it is, at what dose and for whom. Still, these results are very encouraging. This drug is already available and proven safe, and now we have evidence that it affects the levels of proteins that are vital for driving Alzheimer’s disease.”

“I’m hopeful that we will eventually develop drugs that take advantage of the link between sleep and Alzheimer’s to prevent cognitive decline,” he continued. “We’re not quite there yet.”

1. Which can best replace the underlined word “vicious” in paragraph 1?
A.Bad.B.Rare.C.Normal.D.Complete.
2. What can we learn about key Alzheimer’s proteins?
A.They are the cause of insomnia.B.They can make the disease worse.
C.They reflect changes in the brain.D.They are controlled by sleeping pills.
3. What’s Brendan Lucey’s attitude towards taking a sleeping pill to prevent Alzheimer’s?
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