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’t
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
admin
2012-08-10
86
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 age50 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/KR57777K
0
大学英语四级
相关试题推荐
A、Thepapermustbeturnedinontime.B、Thequestionwasn’tveryclear.C、Heshouldaskadifferentperson.D、Hisrequestwasm
A、Beforebreakfast.B、Inthelatemorning.C、Inthelateafternoon.D、Inthelateevening.C
Wouldyoumind__________(与我换一换位置)sothatIcanbenearerthefire?
Acoupleofmonthsago,Iwenttoadepartmentstoretobuyafewthingsforthehouse.Ineededasetofcurtainsforthelivin
A、She’sinameeting.B、She’soutoftheoffice.C、She’stalkingwithanothercustomer.D、She’sspendingherholiday.B细节题。根据四个选
Childrenlearnalmostnothingfromtelevision,andthemoretheywatchthelesstheyremember.Theyregardtelevisionpurely【C1】
A、AtschoolB、Fromtheirparents.C、Frombooks.D、Infactories.B
Astudyofarthistorymightbeagoodwaytolearnmoreaboutaculturethanispossibletolearningeneralhistoryclasses.M
A、Considerdifferentsituations.B、Takeeyecontactintoaccount.C、Respondpositivelytothesituation.D、Payattentiontofaci
A、Shecangowithhimthisafternoon.B、Shehasalottodotoday.C、She’salmostasbusyasheis.D、Shemightbefinishedbyn
随机试题
简述元朝民族融合的新特点。
曹操《短歌行》(其一):周公吐哺,_________。
咬肌间隙感染主要表现为眶下间隙感染主要表现为
下列跳桌法测定水泥胶砂流动度的试验步骤正确的有()。
屋面防水卷材施工时,相邻两幅卷材的接头应相互错开()mm以上。
()是将不同时间内资金的流入和流出换算成同一时点的价值,为不同方案和不同项目的比较提供同等的基础,并能反映出未来时期的发展变化情况。
某大型工程项目进行施工招标,招标人编制了完整、详细的招标文件,内容包括:(1)招标公告;(2)投标须知;(3)通用条件;(4)专用条件;(5)合同格式;(6)图纸;(7)工程量清单;(8)中标通知书;(9)评标委员会名单;(10)投标文
上海植物园是国内最大的植物园。()
稀土是储备较少的一类金属的统称,广泛应用于尖端科技和军工领域。世界上绝大部分稀土产自中国。1998年以来,中国开始减少稀土开采,控制稀土出口配额,加强稀土行业的集中度。对此,一些国家指责中国垄断资源。对世界其他国家“有极大的破坏性”,要求中国放宽对稀土产业
A、Three.B、Four.C、Five.D、Six.D细节题。本题的设题点在数字信息处。男士问女士知不知道paper都有哪些用途,女士一共说出了纸的6种用途,即纸可以用于newspapers,books,writingpaper,envelo
最新回复
(
0
)