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
42
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.
【C2】
选项
A、particularly
B、preliminarily
C、precisely
D、previously
答案
A
解析
副词辨义题。前一句提到“有越来越多的专家认为,许多人体内的维生素D含量不足”,而根据后面的indoors可知,尤其是常在室内工作和运动的人的维生素D摄入量不足。particularly“特别地”符合题意。preliminarily“初步地,预备地”;precisely“精确地,恰恰”;previously“以前,预先”,均不符合文意,故排除。
转载请注明原文地址:https://kaotiyun.com/show/aL57777K
0
大学英语四级
相关试题推荐
A、Itwasmorerespected:B、Morepeopleusedit.C、Itwasdamagedbytouristsagain.D、ItquicklygotworseagainafterLincoln’s
"Tear’emapart!""Killthefool!""Murderthereferee(裁判)!"Thesearecommonremarksonemayhearatvarioussportingevents
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
Whenpeoplebecomeunemployed,itisidlenesswhichisoften____________(比没有收入更糟糕).
Pollutantsaresubstanceswhich,whenpresentathighenoughconcentrations,produceharmfuleffectsonpeopleand/ortheenviro
A、Hethinkshehasbeenovercharged.B、Hedoesn’tlikehisneighbor.C、Heisunhappywiththepresentapartments.D、Heisforced
Inpolicework,youcanneverpredictthenextcrimeorproblem.Noworkingdayisidenticaltoanyother,sothereisno"【B1】__
随机试题
目前介入治疗仅能治疗某些心血管疾病和部分肿瘤。()
以下关于工资制度内容的表述,不正确的是:
为进一步推动大众创业和跨界创新,2015年2月4日,在科技部的指导和支持下,()在全国率先启动“创业中国引领工程”和“互联网跨界融合创新示范工程”。
下列各项中,“战国七雄”指的是()。
Byfarthemostcommondifficultlyinstudyissimplefailuretogetdowntoregularconcentratedwork.Thisdifficultyismuch
简述波斯帝国的兴起及其历史地位。
下列关于贪污罪的说法错误的是()
以下关于数的定点表示或浮点表示的叙述中,不正确的是____________。
下面有关GNU工具套件的描述语句中,不恰当的是()。
关于追加投资额的说法,下列正确的是()。
最新回复
(
0
)