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
23
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://jikaoti.com/ti/MfcFFFFM
0
大学英语四级
相关试题推荐
A、slavesB、maleC、femaleD、prisonersB文章中提到“Slaves,womenanddishonoredpeoplewerenotallowedtocompete.”,采用排除法,可确定答案是B。
A、Thepapermustbeturnedinontime.B、Thequestionwasn’tveryclear.C、Heshouldaskadifferentperson.D、Hisrequestwasm
Notonlycantravel______,(感到心情愉快)itcanalsowidenone’sscopeofknowledge.
Wouldyoumind__________(与我换一换位置)sothatIcanbenearerthefire?
HowtoMakeaGoodImpressionResearchshowsthatwestarttomakeupourmindsaboutpeoplewithinsevensecondsofmeeting
Theentertainmentprofession,orshowbusiness,attractsmanyyoungpeople.【B1】______,onlyveryfewcanhopetobecomefamousa
Acoupleofmonthsago,Iwenttoadepartmentstoretobuyafewthingsforthehouse.Ineededasetofcurtainsforthelivin
Childrenlearnalmostnothingfromtelevision,andthemoretheywatchthelesstheyremember.Theyregardtelevisionpurely【C1】
A、They’vemetbefore.B、Hedoesnotrememberher.C、Sheshouldagreewithhim.D、Theyhavenevermetbefore.A事实状况题。男士说We’vebee
A、AquickdivorceB、CulturalshockC、AbiggapbetweenparentsandchildrenD、Muchsufferinginchildren’smindsD通婚或许会导致父母之间的巨
随机试题
烧伤抗休克补液时,第一个24h输液量从何时计算()
钱某是民营企业家,并开办了一家自己的工厂甲厂。2003年甲厂与乙公司订立了一份客车买卖合同,约定由甲厂向乙公司提供客车30台,乙公司向甲厂支付货款600万元。甲厂履行了合同,乙公司却拒不支付货款。甲厂于2009年6月20日向辽宁省某市中级人民法院提起诉讼,
良等品细部测量为()。
(2006年)图8—39所示电路中,变压器视为理想的,R2=R1,则输出电压与输入电压的有效值之比为()。
某企业2011年2月1日购入需要安装的生产设备一台,价款2000万元,增值税税款340万元,款项均已支付。3月1日开始安装工程,领用企业生产的产品一批,实际成本为480万元;分配工程人员工资540万元。2011年9月20日安装完成并交付使用。该设备估计可使
在加涅总结的信息加工模式中不包含的结构是
阅读下文,完成下列5题。。约言之,藏书的①当能铸冶治学的风气,影响学风,②学术思想的活跃,学术思想的活跃又进一步③学风,并给著述提供津梁。战国时期学术的百家争鸣的出现,无疑与图书事业的发展有千丝万缕的联系。。梁代萧绎出任荆州称帝江陵,,招致饱学之
下列活动图中可以同时执行的活动是_____________。
WhatislackinginNorthAmerica’sretailindustry?
Man:Bill,haveyouheardthelatestnews?Itappearsthatwewon’tbelaidoffafterall.Woman:Oh,somewhatI’mtiredofwork
最新回复
(
0
)