Sweet potatoes are fat-free, high in fiber and full of the vitamins that research suggests reduce your risk of life-shortening diseases. To stay healthy, we must eat more fruits and vegetables, and sw 题目和参考答案——青夏教育精英家教网—

题目内容

Sweet potatoes are fat-free, high in fiber and full of the vitamins that research suggests reduce your risk of life-shortening diseases. To stay healthy, we must eat more fruits and vegetables, and sweet potatoes are a great source of beta carotene(胡萝卜素)and other carotenoids(which the body turns into vitamin A). According to a study of the diets of almost 90,000 nurses, eating about one cup a day of fruits and vegetables rich in carotenoids can cut your risk of stroke in half and reduce your risk of heart disease by 22 percent. Other research suggests beta carotene protects against breast, lung and stomach cancers.
Beta carotene is the most famous member of the carotenoids family. In face, a medium-sized sweet potato contains nearly 12mg of beta carotene(anti-aging experts usually suggest 6 to 11 mg per day). Sweet potatoes are also a low-fat source of vitamin E. Research has linked high E diets with a lower risk of heart disease. This vitamin pill in an orange jacket also packs a vitamin C punchit which has more C than apricots (a kind of fruit). Research suggests that vitamin C protects against ailments (小疾) ranging from cataracts(an eye disease) to cancer. In addition, a UCLA (University of California Los Angeles) study linked high vitamin C diets with a longer life. Recent studies have showed that antioxidant Vitamins C, E and beta carotene fight a fierce battle against free radicals (自由基），which cause cell (细胞)damage and lead to various illness. Therefore, to keep fit, eat more sweet potatoes.
1. According to the text, there exists a lot of ______in sweet potatoes.
A. fiber, beta carotene, other carotenoids, Vitamin E and C
B. beta carotene, other carotenoids, fiber, Vitamin A and E
C. Vitamin A, beta carotene, fiber, Vitamin E and C
D. beta carotene, other carotenoids, Vitamin A and E
2. This text as a whole suggests that eating sweet potatoes can help______.
A. cut your risk of stroke and heart disease
B. protect against breast, lung and stomach cancers
C. protect against ailments ranging from cataracts to cancers
D. you stay healthy and reduce your risk of life-shortening diseases
3. “ This vitamin pill in an orange jacket”in the passage refers to______.
A. sweet potato B. vitamin C pill
C. vitamin E pill D. beta carotene
4. The best title of this passage might be______.
A. The vitamin superstar
B. On sweet potatoes
C. Beta carotene and vitamins
D Diet and disease

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Sweet potatoes are fat-free, high in fiber and full of the vitamins that research suggests reduce your risk of life-shortening diseases. To stay healthy, we must eat more fruits and vegetables, and sweet potatoes are a great source of beta carotene(胡萝卜素) and other carotenoids(which the body turns into vitamin A). According to a study of the diets of almost 90,000 nurses, eating about one cup a day of fruits and vegetables rich in carotenoids can cut your risk of stroke in half and reduce your risk of heart disease by 22 percent. Other research suggests beta carotene protects against breast, lung and stomach cancers.
Beta carotene is the most famous member of the carotenoids family. In face, a medium-sized sweet potato contains nearly 12mg of beta carotene(anti-aging experts usually suggest 6 to 11 mg per day). Sweet potatoes are also a low-fat source of vitamin E. Research has linked high E diets with a lower risk of heart disease. This vitamin pill in an orange jacket also packs a vitamin C punchit which has more C than apricots (a kind of fruit). Research suggests that vitamin C protects against ailments (小疾) ranging from cataracts(an eye disease) to cancer. In addition, a UCLA (University of California Los Angeles) study linked high vitamin C diets with a longer life. Recent studies have showed that antioxidant Vitamins C, E and beta carotene fight a fierce battle against free radicals (自由基），which cause cell damage and lead to various illness. Therefore, to keep fit, eat more sweet potatoes.
72. According to the text, there exists a lot of ______in sweet potatoes.
A. fiber, beta carotene, other carotenoids, Vitamin E and C
B. beta carotene, other carotenoids, fiber, Vitamin A and E
C. Vitamin A, beta carotene, fiber, Vitamin E and C
D. beta carotene, other carotenoids, Vitamin A and E
73. This text as a whole suggests that eating sweet potatoes can help______.
A. cut your risk of stroke and heart disease
B. protect against breast, lung and stomach cancers
C. protect against ailments ranging from cataracts to cancers
D. you stay healthy and reduce your risk of life-shortening diseases
74. “ This vitamin pill in an orange jacket” in the passage refers to______.
A. sweet potato     B. vitamin C pill
C. vitamin E pill    D. beta carotene
75. The best title of this passage might be______.
A. On sweet potatoes             B. The vitamin superstar
C. Beta carotene and vitamins      D. Diet and disease

Scientist Florence Wambugu works with farmers in Kenya, a country in East Africa. She helps them grow bigger and better crops. Wambugu is especially interested in finding simple ways to produce more food.
In the past ten years, Wambugu has spent much of her time studying sweet potatoes, which are an important food in her part of Kenya. A virus (病毒) kept attacking the plants. It stopped the sweet potatoes from growing well. Because of the virus, some farmers lost three quarters of their crops.
Wambugu went to war against the virus. Her research for a way to save the sweet potatoes led to a lab in St. Louis, Missouri.
The lab mainly works on genes (基因), the chemical “computer programs” found in the cells of living things. Genes tell a plant to produce pink flowers or an animal to grow black hair. Now scientists have found ways to move genes from one living thing to another. That process is called genetic engineering.
Wambugu spent three years in the lab. As a result, she created a sweet potato plant that could fight off the virus. Wambugu tested her research in Kenya, and her plants produced wonderful sweet potatoes.
That’s just the beginning, Wambugu believes. Genetically modified (转基因的) foods, she thinks, could help farmers in poor countries grow badly needed crops, thus, fewer people will go hungry.
【小题1】The text is written mainly to _______.

A．tell us sweet potatoes are in danger of being attacked by a virus

B．introduce Wambugu’s contribution to genetic engineering

C．introduce a new way of killing plant viruses

D．tell how hard Wambugu worked in her lab for three years

【小题2】What caused Wambugu to set up a lab in St. Louis, Missouri?

A．Her wish to save sweet potatoes in Kenya.

B．Her great interest in genetic engineering.

C．Her love for sweet potatoes.

D．Her interest in plant life.

【小题3】The fourth paragraph mainly explains what ________ is.

A．a crop virus	B．chemical technology
C．a computer program	D．genetic engineering

【小题4】 What is Wambugu’s attitude toward “genetic engineering”?

A．It will help more hungry people.

B．It should be carefully used.

C．It has more disadvantages than disadvantages.

D．It is a too expensive technology at present.

In the past ten years, Wambugu has spent much of her time studying sweet potatoes, which are an important food in her part of Kenya. A virus (病毒) kept attacking the plants. It stopped the sweet potatoes from growing well. Because of the virus, some farmers lost three quarters of their crops.

Wambugu went to war against the virus. Her research for a way to save the sweet potatoes led to a lab in St. Louis, Missouri.

The lab mainly works on genes (基因), the chemical “computer programs” found in the cells of living things. Genes tell a plant to produce pink flowers or an animal to grow black hair. Now scientists have found ways to move genes from one living thing to another. That process is called genetic engineering.

Wambugu spent three years in the lab. As a result, she created a sweet potato plant that could fight off the virus. Wambugu tested her research in Kenya, and her plants produced wonderful sweet potatoes.

That’s just the beginning, Wambugu believes. Genetically modified (转基因的) foods, she thinks, could help farmers in poor countries grow badly needed crops, thus, fewer people will go hungry.

1.The text is written mainly to _______.

A．tell us sweet potatoes are in danger of being attacked by a virus

B．introduce Wambugu’s contribution to genetic engineering

C．introduce a new way of killing plant viruses

D．tell how hard Wambugu worked in her lab for three years

2.What caused Wambugu to set up a lab in St. Louis, Missouri?

A．Her wish to save sweet potatoes in Kenya.

B．Her great interest in genetic engineering.

C．Her love for sweet potatoes.

D．Her interest in plant life.

3.The fourth paragraph mainly explains what ________ is.

A．a crop virus	B．chemical technology
C．a computer program	D．genetic engineering

4. What is Wambugu’s attitude toward “genetic engineering”?

A．It will help more hungry people.

B．It should be carefully used.

C．It has more disadvantages than disadvantages.

D．It is a too expensive technology at present.

Feed the world

With the global population expected to rise to 9 billion within 50 years, feeding the world has never seemed such a daunting task. But GM(转基因)technology is giving hope to developing countries, where many people think biotechnology can offer improved nutrition, health and prosperity(繁荣).

High hopes

Many scientists in Africa regard GM crops as the only way to avoid mass starvation (饥饿) on the continent. Kenyan researchers recently created a GM sweet potato that they predict could increase yields by up to 80 percent.

Meanwhile, South African scientists have used genetic modification to insert the vaccine (疫苗) for the disease cholera (霍乱) into bananas. Cholera is a particularly serious problem in South Africa. But there are still several barriers that stop developing countries from growing GM crops on a large scale.

Obstacle course

Private enterprise is unwilling to invest in GM products that would benefit developing countries. Regulatory clearance (许可证) to grow a single GM crop can cost companies between $5 (￡3.4 million) and $30 million (￡20.5 million), so they tend to focus on areas that give them large returns on their investment.

Use only once

In traditional farming, some seeds from a harvest are saved to be planted the following year. But biotech companies force farmers growing GM crops to buy new supplies of seed every harvest. Farmers in Canada have even been sued(控告)for re-planting GM seed.

But biotech companies think it will be harder to enforce this rule in developing countries, so they have been coming up with cunning(狡猾的)methods to make farmers come back for seed each year.

This approach could make farmers too dependent on such companies for their livelihoods, leading them to neglect the basic farming skills they would need to rely on if their situation changed and possibly bankrupted (破产) them.

Going it alone

Developing countries are making real progress in genetic engineering, and have already produced their own GM crops. But many environmentalists are worried that developing nations would not apply strict testing to GM crops and food safety regulations (规章).

5. From the first paragraph we know that ________.

A. food supply for the whole world is out of question because of GM technology

B. food supply for the whole world is still a serious problem because of the increasing of population

C. food supply for the whole world is never a problem because of biote chnology

D. people in developing countries will never have food shortage because of GM technology

6. The purpose of growing GM crops is ________.

A. to provide safer food for the world

B. to find a new cure to the disease cholera

C. to get a lot of money by selling the seeds

D. to prevent the world from mass starvation

7. Some enterprises are unwilling to spend money on GM products because ________.

A. the products will benefit developing countries

B. they have to pay a large amount of money to get the permit

C. they don't have much knowledge about the GM technology

D. they can't get enough seeds from the biotech companies

8. It can be inferred that________.

A. growing GM crops would possibly make farmers bankrupt

B. companies could grow GM crops freely once they had the GM technology

C. developing countries are growing GM crops on a large scale

D. scientists are not sure about whether GM crops are safe to eat

Beta carotene is the most famous member of the carotenoids family. In face, a medium-sized sweet potato contains nearly 12mg of beta carotene(anti-aging experts usually suggest 6 to 11 mg per day). Sweet potatoes are also a low-fat source of vitamin E. Research has linked high E diets with a lower risk of heart disease. This vitamin pill in an orange jacket also packs a vitamin C punchit which has more C than apricots (a kind of fruit). Research suggests that vitamin C protects against ailments (小疾) ranging from cataracts(an eye disease) to cancer. In addition, a UCLA (University of California Los Angeles) study linked high vitamin C diets with a longer life. Recent studies have showed that antioxidant Vitamins C, E and beta carotene fight a fierce battle against free radicals (自由基），which cause cell damage and lead to various illness. Therefore, to keep fit, eat more sweet potatoes.

72. According to the text, there exists a lot of ______in sweet potatoes.

A. fiber, beta carotene, other carotenoids, Vitamin E and C

B. beta carotene, other carotenoids, fiber, Vitamin A and E

C. Vitamin A, beta carotene, fiber, Vitamin E and C

D. beta carotene, other carotenoids, Vitamin A and E

73. This text as a whole suggests that eating sweet potatoes can help______.

A. cut your risk of stroke and heart disease

B. protect against breast, lung and stomach cancers

C. protect against ailments ranging from cataracts to cancers

D. you stay healthy and reduce your risk of life-shortening diseases

74. “ This vitamin pill in an orange jacket” in the passage refers to______.

A. sweet potato B. vitamin C pill

C. vitamin E pill D. beta carotene

75. The best title of this passage might be______.

A. On sweet potatoes B. The vitamin superstar

C. Beta carotene and vitamins D. Diet and disease

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