If you are taking vitamin supplements to redu...

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, producers 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 aspect.

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. adequate 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 aspects, taking vitamins is not useful.

C. Producers 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 Diseases May Fail

高二英语阅读理解中等难度题查看答案及解析

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

高二英语阅读理解中等难度题查看答案及解析

Now, we know that if we do not get enough vitamins, we are at risk of developing a number of diseases. As a result, vitamin supplements（补品），though expensive, are popular with people who worry that they are not getting enough vitamins from the foods they eat. But contrary to what many people think, medical experts have found little evidence that most supplements do anything to improve health or protect against disease.

In fact, medical experts warn that taking too many of some vitamins can be harmful. For example, too much vitamin E can cause bleeding. People should discuss what vitamins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines.

Experts, however, say that sometimes vitamins can help prevent disease. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin B-twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time inside may need some extra vitamin D as the skin makes this vitamin from sunlight.

Different vitamins are found in different foods. Vitamin A is found in fish liver oil. It also is in the yellow part of eggs. Sweet potatoes, carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A. Vitamin B-twelve is found in green leafy vegetables and other foods, like fruits. Vitamin K can be found in pork products.

In fact, for most people, a balanced diet can ensure enough of the vitamins our bodies need. So, it is important for us to eat a mixture of foods every day to ensure that we get enough vitamins our bodies need.

1.What is probably talked about before this passage?

A. How many vitamins a person’s body needs.

B. How many vitamins some foods contain.

C. The benefits that vitamins bring to our health.

D. What people should do to stay healthy.

2.Vitamin supplements are popular with people because ________.

A. people mistakenly think that they are good for their health

B. they contain more vitamins than the foods people eat

C. food does not provide enough vitamins people need

D. people fear that a lack of vitamins will lead to disease

3.From the passage, we can learn that medical experts advise people _________.

A. never to take any vitamin supplements

B. to depend only on food for their vitamins

C. not to take any vitamins together with medicines

D. to consult doctors before taking vitamin supplements

4.For people who lack Vitamin B-twelve, they can eat more from _______.

A. sweet potatoes　　 B. green leafy vegetables

C. pork products　　 D. eggs

高二英语阅读理解中等难度题查看答案及解析

Now, we know that if we do not get enough vitamins, we are at risk of developing a number of diseases. As a result, vitamin supplements（补品），though expensive, are popular with people who worry that they are not getting enough vitamins from the foods they eat. But contrary to what many people think, medical experts have found little evidence that most supplements do anything to improve health or protect against disease.

In fact, medical experts warn that taking too many of some vitamins can be harmful. For example, too much vitamin E can cause bleeding. People should discuss what vitamins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines.

Experts, however, do say that sometimes vitamins can help prevent disease. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin B-twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time inside may need some extra vitamin D as the skin makes this vitamin from sunlight.

Different vitamins are found in different foods. Vitamin A is found in fish liver oil. It also is in the yellow part of eggs. Sweet potatoes, carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A. Vitamin B-twelve is found in green leafy vegetables and other foods, like fruits. Vitamin K can be found in pork products.

In fact, for most people, a balanced diet can ensure enough of the vitamins our bodies need. So, it is important for us to eat a mixture of foods every day to ensure that we get enough vitamins our bodies need.

1.Vitamin supplements are popular with people because ________.

2.From the passage, we can learn that medical experts advise people _________.

3.For people who lack Vitamin B-twelve, they can eat more from _______.

A. sweet potatoes   B. pork products   C. green leafy vegetables  D. eggs

42. What would be the best title of the passage?

A. Getting enough vitamins through a balanced diet.

B. Vitamin supplements do harm to our health.

C. Vitamins are important to our health.

D. Lacking vitamins can cause many diseases.

高二英语阅读理解困难题查看答案及解析

Cancer researchers urged people on Wednesday to take more vitamin D to lower risk of cancer, saying studies showed a clear link. “Our suggestion is for people to increase their intake (吸入，摄入), through diet or a vitamin supplement,” Dr. Cedric Garland said in a telephone interview.

Garland's research team reviewed 63 studies, including several large long-term ones, on the relationship between vitamin D and certain types of cancer worldwide between 1966 and 2004. “There's nothing that has this ability to prevent cancer,” he said, urging governments and public health officials to do more to fortify (增强) foods with vitamin D. Garland is part of a University of California at San Diego Moores Cancer Center team that published its findings this week online in the American Journal of Public Health. Vitamin D is found in milk, as well as in some fortified orange juice, yogurt and cheeses, usually at around 100 international units（IU）a serving. “People might want to consider a vitamin supplement to raise their intake to 1000 IUs per day” Garland said, adding that it was well within the safety guidelines established by the National Academy of Sciences.

The authors said that taking more vitamin D could be especially important for people living in northern areas, which receive less vitamin D from sunshine.

“African Americans, who don't produce as much of the vitamin because of their skin colour, could also benefit significantly from a higher intake,” the authors said.

1.According to the passage, people are advised to take more Vitamin D, because__.

A. it is nutritious                 B. it can’t harm people’s health

C. it can lower cancer risk          D. it is not taken enough every day

2.Which of the following can not help people get more Vitamin D?

A. Have some sunshine            B. Have more meat

C. Have more fortified cheese       D. Have a vitamin supplement

3.Who can Garland probably be?

A. A health researcher             B. A doctor

C. A scientist                    D. A public health official

4.Which of the following food can lower people‘s chance of getting cancer?

A. Milk                         B. Fortified orange juice

C. Fortified yogurt                D. All of the above

5.People from which area should take more Vitamin D according to the passage?

A. Asian people                  B. African people

C. American people               D. European people

高二英语阅读理解中等难度题查看答案及解析

If you take _______ risk of drunk driving, you are at _______ risk.

A. a; the         B. the; a           C. /; /            D. the; /

高二英语单项填空困难题查看答案及解析

If you take __________risk of not wearing a seat belt, you will be at __________risk.

A．/; /　　　B．/; the             C．the; /                           D．the; the

高二英语单项填空中等难度题查看答案及解析

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1.This advertisement is designed especially for those who____________.

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2.What information CAN'T we get from the advertisement about Ouickeats?

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高二英语阅读理解中等难度题查看答案及解析

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高二英语单项填空中等难度题查看答案及解析

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高二英语单项填空中等难度题查看答案及解析