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
90
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.
【C19】
选项
A、forward
B、through
C、on
D、over
答案
C
解析
固定搭配辨义题。此处意为“但是随着研究的继续,一些专家担心如果人们摄取太多的维生素D,就变成了毒药”,carry on“继续,进行”符合题意。carry forward“发扬,推进”;carry through“贯彻,完成”;carry over“继续存在”,均不符合文意,故排除。
转载请注明原文地址:https://kaotiyun.com/show/yL57777K
0
大学英语四级
相关试题推荐
A、Thetwopeoplecanlearnabouteachother’slikesanddislikes.B、Thetwopeoplecanhavetimetodecideiftheyareagoodma
7Thereisnodoubtthatpeoplecanliveamucheasierlife______.(有了计算机的帮助)
7Therehasbeen______(稳步提高)inpeople’slivingstandardinrecentyears.
A、Itwasmorerespected:B、Morepeopleusedit.C、Itwasdamagedbytouristsagain.D、ItquicklygotworseagainafterLincoln’s
Wecommonlythinkofsportsmanshipinconnectionwithathleticcontests,butitalsoappliestoindividualoutdoorsports.Note
A、Thenewsaboutthefirmisnottrue.B、Theinternationalcompanywillgetcontrolofthefamilyfirm.C、Stockholdersaresprea
A、Hethinkshehasbeenovercharged.B、Hedoesn’tlikehisneighbor.C、Heisunhappywiththepresentapartments.D、Heisforced
A、Johnmissedatest.B、Johnhaskepthisjob.C、Johnhasstolenacar.D、Johnwascalledathief.D
Ifwehadn’tbeenworkinghardinthepastfewyears,____________(现在一切就不会进行得这样顺利).
随机试题
报告的含义。
女性,28岁,右下腹痛、腹泻伴关节酸痛、低热半年。查体心肺正常,腹软,右下腹部可触及可疑肿块;X线钡餐检查显示回盲部有钡影跳跃征象。最可能的诊断是
危重烧伤患者治疗的全过程要经历
女性,32岁,5个月来胸部发麻、渐渐累及下肢。双下肢乏力8天,伴小便潴留并留置导尿管,无疼痛。查体:胸5以下触觉消失,有马鞍回避。双下肢振动觉消失、肌力3级、膝踝反射亢进、Babinski征阳性。腹壁反射消失,腰穿示脊管不完全阻塞。脑脊液蛋白0
下列选项中,应当缴纳增值税的有()。
狭义的财政管理体制是指()。
当经济萧条时,财政可以通过()发挥调控经济的职能。
肖晓活泼好动,善于交际,思维敏捷,易接受新事物,兴趣广泛,注意力容易转移。他的气质类型属于()。
设在[0,1]上f"(x)>0,则f’(0),f(1),f(1)一f(0)或f(0)一f(1)的大小顺序是
Whatdoesyourdoctorusuallyadviseyoutodowhenyou’requitesick?To______.
最新回复
(
0
)