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  3. Diet, Alcohol Linked to Nearly One Third of Cancers Diet is second only to tobacco as a leading(51)of cancer and, along with alc

Diet, Alcohol Linked to Nearly One Third of Cancers Diet is second only to tobacco as a leading(51)of cancer and, along with alc

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问题 Diet, Alcohol Linked to Nearly One Third of Cancers
Diet is second only to tobacco as a leading(51)of cancer and, along with alcohol, is responsible for nearly one third of cases of the disease(52)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(53), but they know that diet, alcohol and obesity(54)a major role.
"Five percent of cancers could be avoided(55)nobody was obese," he said.
While tobacco is linked to about 30(56)of cancer cases, diet is involved in an estimated 25 percent and alcohol(57)about six percent.
Obesity raises the(58)of breast, womb, bowel and kidney cancer, while alcohol is known to cause cancers of the mouth, throat and liver. Its dangerous impact is(59)when combined with smoking.
Key told the meeting of the charity Cancer Research UK(60)other elements of diet linked to cancer are(61)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(62).
Early results of the study have revealed that Norway, Sweden and Denmark have the(63)consumption of fruit and vegetables among European countries while Italy and Spain have the highest. Eating at(64)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(65)colorectal, breast and prostate.
选项 A、while
B、if
C、unless
D、since
答案B
解析 前一句讲到，饮食、喝酒与肥胖在癌症发生的过程中扮演重要角色，此句应为虚拟句，表示假设。
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