题目内容
Diet, Alcohol Linked to Nearly One Third of Cancers
Diet is second only to tobacco as a leading(1)of cancer and，along with alcohol，is responsible for nearly one third of cases of the disease(2)developed countries, a leading researcher said on Tuesday.
Dr. Tim Key, of the University of Oxford, told a cancer conference that scientists are still discovering how certain foods contribute to(3), but they know that diet, alcohol and obesity(4)a major role.
"Five percent of cancers could be avoided(5)nobody was obese," he said.
While tobacco is linked to about 30(6)of cancer cases, diet is involved in all estimated 25 percent and alcohol(7)about six percent.
Obesity raises the(8)of breast, womb, bowel and kidney cancer, while alcohol is known to cause cancers of the mouth, throat and liver. Its dangerous impact is(9)when combined with smoking.
Key told the meeting of the charity Cancer Research UK(10)other elements of diet linked to cancer are(11)unknown but scientists are hoping that the EPIC study, which is comparing the diets of 500, 000 people in 10 countries and their risk of cancer, will provide some(12)
Early results of the study have revealed that Norway, Sweden and Denmark have the(13) consumption of fruit and vegetables among European countries while Italy and Spain have the highest. Eating at(14)five portions of fruit and vegetables a day is recommended to reduce the risk of cancer.
Key, principal scientist on the EPIC study, said it is looking at dietary links to some of the most common cancers(15)colorectal, breast and prostate.
obesity n. 肥胖
bowel n.肠
dietary adj. 饮食的
prostate adj. 前列腺的
obese adj. 肥胖的
womb n.子宫
colorectal adj. 结肠直肠的
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Less-educated people report fewer days of stress possibly because
The less advantaged people are, the greater
The brain controls the other body activities through______.
What Is Death？
People in the past did not question the difference between life and death. They could see that a person died when his heart stopped beating. People have learned, however, that the body does not die immediately when the heart stops beating. They discovered that we remain alive as long as our brain remains active. Today the difference between life and death is not as easy to see as in the past. Modern medical devices can keep the heart beating and the lungs breathing long after the brain stops. But is this life？
This question has caused much debate among citizens in the United States. Many of them want a law that says a person is dead when the brain dies. A person should be considered dead when brain waves stop even if machines can keep the body alive. Such a law would permit doctors to speed removal (切除) of undiseased (没病的) organs for transplant (移植) operations.
The brain is made of thousands of millions of nerve cells. These cells send and receive millions of chemical and electrical messages every day. In this way the brain controls the other body activities. Nerve-cell experts say it usually is easy to tell when the brain has died. They put small electrodes (电极) on a person's skull (头骨) to measure the electrical signals that pass in and out of the brain. These brain waves are recorded on a television screen or on paper. The waves move up and down every time the brain receives messages from the nerve cells. The brain is dead when the waves stop moving.
Although there are people who oppose the idea of a law on brain block for variouis reasons, the idea of brain wave activity as a test of death is slowly being accepted.
People in the past held that the difference between life and death______.
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