首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
医学
Among all the malignancies, lung cancer is the biggest killer; more than 100, 000 Americans die of the disease. Giving up smokin
Among all the malignancies, lung cancer is the biggest killer; more than 100, 000 Americans die of the disease. Giving up smokin
admin
2018-03-26
28
问题
Among all the malignancies, lung cancer is the biggest killer; more than 100, 000 Americans die of the disease. Giving up smoking is one of obvious ways to reduce the risk, but another answer may lie in the kitchen. According to a new report, even heavy smokers may be protected from developing lung cancer by eating a daily portion of carrots, spinach or any other vegetable or fruit containing a form of vitamin A called carotene.
The finding, published in THE LANCET, is part of a long-range investigation of diet and disease. Since 1957, some American researchers have monitored the dietary habits and medical histories of 2, 000 middle-aged men employed by the Western Electric Co. in Chicago. Led by Dr. Richard Shekelle of St. Luke’s Medical Center, the researchers recently began to sort out the links between the subjects’ dietary patterns and cancer.
Other studies of animals and humans have suggested that vitamin A offer some protection against lung cancer. The correlation seemed logical, explains Shekelle, since vitamin A is essential for the growth of the epithelial tissue that lines the airways of the lungs.
Vegetables: But the earlier research did not distinguish between the two different forms of the vitamin. "Preformed" vitamin A, known as retinols found mainly in liver and dairy products like milk, cheese, butter and eggs. But vitamin A is also made in the body from carotene, which is abundant in a variety of vegetables and fruits, including carrots, spinach, squash, tomatoes, sweet potatoes and apples.
In the study, Shekelle and his colleagues found little correlation between the incidence of lung cancer and the consumption of foods containing preformed vitamin A. But when they examined the data on carotene intake, they discovered a significant relationship. Among the 488 men who had the lowest level of carotene consumption, there were 14 cases of lung cancer; in a group of the same size that ate the most carotene, only two cases developed. The apparent protective effect of carotene held up even for long-time smokers—but to a lesser degree.
Further studies will be necessary before the link between lung cancer and carotene can be firmly established. In the meantime, researchers warn against taking large numbers of vitamin A pills, because the tablets contain a form of the chemical that can be extremely toxic in high doses. Instead, they advise a well-balanced diet that includes goods rich in carotene. For a smoker, a half-cup of carrots every day might possibly make the difference between life and death.
What is needed to establish firmly the link between carotene and lung cancer?
选项
A、Further study.
B、More money.
C、More cases of lung cancer.
D、More people willing to eat carrots.
答案
A
解析
细节题。最后一段第一句“在胃癌和胡萝卜素之间建立牢固的联系之前有必要进行进一步的研究。”因此选择further study。
转载请注明原文地址:https://jikaoti.com/ti/wdxDFFFM
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
Imagineadiseasespreadingacrosstheglobe,killingmostlymiddle-agedpeopleorleavingthemchronicallydisabled.Thenoned
Cultureshockmightbecalledanoccupationaldiseaseofpeoplewhohavebeensuddenlytransplantedabroad.Likemostailments,
Cultureshockmightbecalledanoccupationaldiseaseofpeoplewhohavebeensuddenlytransplantedabroad.Likemostailments,
Theeducatorsshouldtryhardtodevelopthe______abilitiesofchildren.
A、Herlegswerebroken.B、Herarmswerebroken.C、Hershoulderswereseverelyinjured.D、Hercervicalvertebraewereseriouslyi
A、Becausetheyhavemorenervecells.B、Becausetheyhavemorebrainchemicals.C、Becausetheyhavestrongermuscles.D、Because
MostofthestreetsofManhattanwerelaidoutsystematically,makingiteasyforpeopletofindtheirway
A、Toavoidpredators.B、Toexposetileeggstostrongersunlight.C、Tohaveabetterviewofpredators.D、Tosavelabor.A从“but
Hergenerosityisoneofhermostpleasingtraits.
Theleopardisstrongerthananyotherofthegreatpredators.
随机试题
元气耗损和功能减退,脏腑功能低下。抗病能力下降的病机是()
A、清热解毒,祛瘀止痛B、活血止痛,消肿生肌C、活血祛瘀,凉血止血D、破血行气,消积止痛E、破血行气,通经止痛没药辛散苦泄,芳香走窜,主入心、肝经,兼入脾经。功与乳香相似,其功效为
亲水性最弱的黏土矿物是:
建设项目管理的工作内容包括()。
某铁路施工企业于2011年10月发生如下业务:购买固定资产支出100万元,支付罚款2万元,第一项目部机械使用费10万元,材料二次搬运费2万元,工程定位复测费2万元。根据企业会计准则及相关规定,属于企业直接费用的有()。
利润计划轮盘是罗伯特.西蒙斯提出的一种基于企业战略的业绩评价模式,其构成为利润轮盘、现金轮盘和()。
甲公司生产的炫目3D电子显示屏产品已逐渐为市场所接受,订单应接不暇。甲公司决定开始大规模生产,并逐渐铺设大规模分销渠道。据此判断,甲公司所处的产业阶段为()。
教育目的是衡量教育活动效果的根本依据和标准,这反映了教育目的的()。
下列关于罪名与罪状关系的说法正确的有()。
不属于对象构成成份的是
最新回复
(
0
)