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
29
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
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(保护区)(ANWR)tohelpsecureAmerica’senergyfuture?PresidentBush
Peopleappeartobeborntocompute.Thenumericalskillsofchildrendevelopsoearlyandsoinexorably(坚定地)thatitiseasyto
A、Shehasapart-timejob.B、Shereceivedascholarship.C、Herparentspayforit.D、Sheisworkingasatouristguide.B细节题。四个选
"Tear’emapart!""Killthefool!""Murderthereferee(裁判)!"Thesearecommonremarksonemayhearatvarioussportingevents
A、Clothingstoreswherepeoplearerelaxedandoffguard.B、HotelsandrestaurantsinsoutheastLondon.C、Airportswherepeople
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply--allthesewereimportant【C1】______inhelpingEng
Drunkendriving,sometimescalledAmerica’ssociallyacceptedformofmurder,hasbecomeanationalepidemic(流行病).Everyhourof
ThomasWheeler,【B1】______oftheMassachusettsMutualLife【B2】______Company,andhiswifeweredrivingalonganinterstatehighw
ThomasWheeler,【B1】______oftheMassachusettsMutualLife【B2】______Company,andhiswifeweredrivingalonganinterstatehighw
A、Byraisingcattle.B、Byworkingonfarms.C、Byworkinginfactories.D、Byraisingsheep.C
随机试题
某县公安局刑事警察赵某下班期间发现有人斗殴,即予以制止。正巧打架的马某与赵某有隙,便对赵某出言不逊。赵某大怒,拔枪将马某击伤。下列关于赔偿责任正确的说法是:()
咨询服务招标的主要特点是什么?
根据《中华人民共和国环境影响评价法》的规定,建设项目的环境影响报告书的内容不包括()。
倒虹吸管施工主要工序的顺序为()。
图书室、资料室、档案室和存放文物的房间,其顶棚、墙面应采用A级装修材料,地面应采用不低于( )级的装修材料。
消费者市场是指所有为了()而购买物品或服务的个人和家庭所构成的市场。
根据下表提供的信息回答下列问题。
优劣:困难
Withreferencetothenews,theAfricanaviationmarketwillbeboostedby
Asweallknow,drinkingandsmokingaffectpeople’shealth.Arecentstudyof17000Canadians【B1】______thatpeoplewhodrink
最新回复
(
0
)