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
66
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.
【C5】
选项
A、sort
B、kind
C、variety
D、manner
答案
C
解析
固定搭配辨义题。由wide可知,此处指维生素D能帮助人体抵御多种疾病的困扰。a variety of“种种,各种各样的”符合题意。a sort of“一种,有点”;a kind of“一种,一类”;a manner of“一种”,均不符合文意,故排除。
转载请注明原文地址:https://kaotiyun.com/show/eL57777K
0
大学英语四级
相关试题推荐
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(保护区)(ANWR)tohelpsecureAmerica’senergyfuture?PresidentBush
Thelocalgovernmenthassetupanumberoftechnicalschoolstomeettheneedsof__________(迅速发展的经济)intheregion.
A、He’salreadycompletedtheprogram.B、Hedoesn’tknowthenurse’sphonenumber.C、Hedoesn’thavetimetocall.D、He’dliketo
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
Drunkendriving,sometimescalledAmerica’ssociallyacceptedformofmurder,hasbecomeanationalepidemic(流行病).Everyhourof
A、Hethinkshehasbeenovercharged.B、Hedoesn’tlikehisneighbor.C、Heisunhappywiththepresentapartments.D、Heisforced
Thedifferencebetweenaliquidandagasisobvious【C1】______theconditionsoftemperatureandpressurecommonlyfound【C2】_____
Ifwehadn’tbeenworkinghardinthepastfewyears,____________(现在一切就不会进行得这样顺利).
Withoutthattemporaryworking-site,thestudent__________(不可能按时完成设计).
A、Itoffersnightclassesenablingthestudenttocontinueathispresentjob.B、Itgivesscholarshipstostudentsworkinginla
随机试题
根据电磁感应原理将机械能转换为电能的动力设备称为电动机。
成人子宫体与子宫颈的长度比例是
在X线立体定向放射治疗计划设计时,如果靶区在横截面内是个三角形可用_______,再安排准直器的大小
压力为0.1MPa的水定压加热到102℃,加热终了的状态处于()。
项目决策分析与评价的目的是为()提供科学的可靠依据。
轴心受压钢构件的局部稳定是通过限制构件的()来保证的。
认为迁移是具体的、有条件的迁移理论是
甲公司法定代表人赵某与乙公司法定代表人孙某签订了一份服装购销合同,下列关于这份合同效力的叙述,正确的有()。
WhoismostlikelytogethookedinInternet?
Thenatureofworkischanging.Recenttechnologicaladvances,ashiftfrommanufacturingtoservice-basedorganizations,incr
最新回复
(
0
)