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
外语
Sunlight is a great source of vitamin D in most of the world. Yet a (an)【C1】______number of experts think that many people aren’
Sunlight is a great source of vitamin D in most of the world. Yet a (an)【C1】______number of experts think that many people aren’
admin
2012-07-05
55
问题
Sunlight is a great source of vitamin D in most of the world. Yet a (an)【C1】______number of experts think that many people aren’t getting enough vitamin D—【C2】______those who work and play indoors.
It’s long been known that vitamin D is【C3】______for strong bones. Research in the last several years has shown that low levels of vitamin D may increase the risk of heart【C4】______in men and deaths from some cancers. But new research suggests that it also protects against a wide【C5】______of diseases. Low levels of vitamin D have also been【C6】______with various forms of cancer and high blood pressure, stroke,【C7】______illness etc. The strongest source,【C8】______far, is ultraviolet (紫外线) B rays from the sun, which【C9】______a form of cholesterol (胆固醇) into vitamin D in the skin. But UVB rays【C10】______greatly depending on cloud cover, time of year and time of day. Dark-skinned and elderly people don’t【C11】______vitamin D from the sun as【C12】______as younger, fair-skinned people. UVB rays also don’t【C13】______glass or sunscreen with a factor of 8 or more. It’s difficult to get much vitamin D through diet. Few foods【C14】______it naturally. It’s widely【C15】______that most people need some supplemental vitamin D—the question is, how much? Current U. S. guidelines, issued in 1997,【C16】______for 200 international units from birth through age 50. The National Osteoporosis Foundation【C17】______adults over age 50 to get at least 800 to 1,000 IUs to【C18】______against fractures (骨折).
But as some experts research carry【C19】______the experiment, they worry that if people take too much vitamin D, it might act as a poison. Also, skin doctors warn people to be careful with sun【C20】______because of the risk of skin cancer.
【C16】
选项
A、cover
B、budget
C、call
D、account
答案
C
解析
动词词组辨义题。本句意为“美国1997年颁布的指导意见是,从出生到50岁每天应补充200国际单位(IU)的补充维生素”,call for“要求,需要,提倡”符合题意。cover for“代替”;budget for“为……做预算”;account for“对……负有责任,对……做出解释”,均不符合文意,故排除。
转载请注明原文地址:https://kaotiyun.com/show/wL57777K
0
大学英语四级
相关试题推荐
A、Hewantstobecomeacook.B、Hehopestogoontograduateschool.C、Hewantstotravelaroundtheworld.D、He’dliketowork
"Tear’emapart!""Killthefool!""Murderthereferee(裁判)!"Thesearecommonremarksonemayhearatvarioussportingevents
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
Drunkendriving,sometimescalledAmerica’ssociallyacceptedformofmurder,hasbecomeanationalepidemic(流行病).Everyhourof
Drunkendriving,sometimescalledAmerica’ssociallyacceptedformofmurder,hasbecomeanationalepidemic(流行病).Everyhourof
ThomasWheeler,【B1】______oftheMassachusettsMutualLife【B2】______Company,andhiswifeweredrivingalonganinterstatehighw
ThomasWheeler,【B1】______oftheMassachusettsMutualLife【B2】______Company,andhiswifeweredrivingalonganinterstatehighw
Thedifferencebetweenaliquidandagasisobvious【C1】______theconditionsoftemperatureandpressurecommonlyfound【C2】_____
随机试题
小明在学习化学元素“氢”时,总是忘记它的特性。于是他编了个顺口溜:“我是氢,我最轻,火箭靠我运卫星。”自此以后他对“氢”的特性便记忆得非常深刻了。小明采取的学习策略是()。
函数z=xy在点(0,0)处()
结核菌素试验结果判定错误的是
患者,女性,72岁。因记忆力进行性下降、失语、经常外出后迷路不归,诊断为老年痴呆症,治疗该疾病目前最常用的药物是()
按照金融工具的发行和转让流通的不同,金融市场可以分为()。
心理辅导的基本目标是()。
新式数字迷信指由于数字的谐音,人们将一些生活的寓意强加在一些特殊数字上的现象,这种基于数字迷信的“人造节日”,让很多原本普通的日子变得生动了起来。成为社会各个阶层追逐的对象。根据上述定义,下列不属于新式数字迷信的是:
【2014新疆NO.7】①垃圾食品不仅没营养,还可能让人脾气变坏②目前,研究已显示,吃垃圾食品的人更愿意用暴力行为解决问题,脾气也更坏,但具体数据还没有公布③牛津大学科学家以1000名16~21岁的男女为研究对象,他们将分为两组,一组长期服用维生素和营
美国的垄断组织主要采取的形式是()。
科举制度源于()。
最新回复
(
0
)