根据下面资料，回答题 We have heard a lot about the health benefits of tea, espe-考呗网题库移动版

单选题根据下面资料，回答题
We have heard a lot about the health benefits of tea, especially green tea. It is high in poly-phenols, compounds with strong antioxidant activity that in test-tube and animal models show anti-cancer and heart-protective effects. Good clinical studies are few, however, and although physi-cians tell their patients to drink green tea, there hasn´ t been any definite proof of the value of that advice.
A team of Japanese researchers was able to link green tea consumption with decreased mortali-ty from many causes--including heart disease. The researchers tracked 40,530 healthy adults ages 40 to 79 in a region of northeastern Japan where most people drink green tea, following them for up to 11 years. Those who drank five or more cups of green tea a day had significantly lower mor-tality rates than those who drank less than one cup a day. There were also fewer deaths from cardiovascular disease.
But no such association was seen with deaths from cancer. Nor was consumption of oolong or black tea connected with any decrease in mortality. Those teas are easier to be combined with oxy-gen in processing, which not only darkens the color of the leaves and changes their flavor but also reduces their polyphenol content.
Coffee is more complicated. It has received both gold stars and black marks in medical litera-ture. It, too, contains antioxidants, although they are less well studied than tea polyphenols. Evi-dence for the health benefits of coffee is growing, however. A group of investigators from Finland,Italy and the Netherlands reports that coffee seems to protect against age-related decline in mental capacity. The scientists studied 676 healthy men born from 1900 to 1920 and followed them for 10 years, using standardized measures of brain function. Their conclusion: the men who consumed
coffee had significantly less decline in mental capacity than those who didn´ t. Three cups a day seemed to provide the most protection.
Population studies like those help us form assumptions about relationships between dietary hab-its and long-term health. We still have to test our suppositions in controlled conditions, and measure the effects of coffee and tea on various systems of the body.
Physicians often tell their patients to drink green tea because__________．

A．its medical value has been proved
B．it is believed to be good for one’s health
C．it has long since been used clinically
D．its effectiveness has been shown in animals

参考答案B

解析:参考译文
我们听过很多茶叶对人体健康有益的说法，尤其是绿茶。它富含大量的茶多酚、抗氧化剂，在试管实验及动物测试中具有抗癌和保护心脏的作用。然而，至今没有多少有效的临床试验。尽管医生建议他们的病人多喝绿茶，但没有确切的数据证明这个建议的有效性。
一组日本研究者将饮用绿茶与诸如心脏病等因素导致的死亡率下降相联系。他们追踪了40530名年龄在40至79岁的健康成人，这些人生活在日本东北地区，这里大多数的人都有喝绿茶的习惯。这一研究进行了11年之久。与每天饮用不到一杯绿茶的人相比，每天饮用五杯及以上绿茶的人的死亡率要低得多。因心血管疾病而死亡的也少很多。
但是饮用绿茶与癌症死亡没有直接联系。饮用鸟龙茶或红茶与疾病死亡率降低也无直接关联。这些茶在处理过程中易氧化，不仅颜色变深，气味发生变化，茶多酚含量也会降低。
咖啡更加复杂。它在医学界的评价褒贬不一。咖啡同样富含抗氧化剂，尽管人们对茶多酚的研究更多，然而越来越多的证据表明咖啡对健康有益。一群来自芬兰、意大利和荷兰的研究者报道咖啡有预防老化引起的智力衰退的可能。科学家们使用科学的大脑功能测试方法对676名出生于1900至1920年的健康成人跟踪研究了10年。他们得出的结论是：与不饮用咖啡的人相比，经常饮用咖啡的人在智力衰退方面明显下降得要慢些。一天三杯咖啡能提供最好的保护。诸如此类的群体研究能帮助我们推测饮食习惯与长期健康的关系。我们同样要对这些假设在可控环境下进行测试，并测量咖啡和茶对人体各系统的影响。
推断题。从文章第一段第一句“We have heard a lot about the health benefits of tea，especially green tea．”及第三句“Good clinical studies are few，however，and although physicians tell their patients to drink green tea，there hasn’t been any definite proof of the value of that advice．”可知，医生建议病人多喝绿茶并没有确切的数据证明这个建议的有效性，只是据说绿茶对人体健康有好处，故选B。

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单选题The Japanese study seems to have confirmed the positive effect of green tea on__________．

A．young adults
B．Asian people
C．patients with cancer
D．patients with heart disease

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单选题The text indicates that black tea differs from green tea in that__________．

A．it Can retain the color of its leaves
B．it Can reduce cancer-related deaths
C．it contains less polyphenol content
D．it is stronger in flavor than the latter

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单选题Coffee is beneflcial to one’s health because__________ .

A．it has more antioxidants than green tea
B．it slows down the rate of brain aging
C．it lowers the rate of natural mortality
D．it keeps systems of the body active

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