首页
登录
职称英语
Sunlight is a great source of vitamin D in most of the world. Yet a (an)【C1】
Sunlight is a great source of vitamin D in most of the world. Yet a (an)【C1】
游客
2024-02-20
43
管理
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. [br] 【C4】
选项
A、erosion
B、attacks
C、awareness
D、strikes
答案
B
解析
名词辨义题。本句意为“过去几年的研究发现,维生素D摄取不足的男性罹患心脏病的风险更高”。heart attacks“心脏病,心脏病发作”符合题意。erosion“侵蚀,腐蚀”;awareness“意识,认识”;strikes“打击,攻击”,均不符合文意,故排除。
转载请注明原文地址:https://tihaiku.com/zcyy/3466080.html
相关试题推荐
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
随机试题
Citiescanbefrightenedplaces.Themajorityofthepopulationliveinnois
Formostlearners,skilllearningbeginswiththecognitivestage.Duringth
StoryTellingI.StatusofstorytellingA.Inthep
Designofallthenewtoolsandimplementsisbasedoncarefulexperiments
[originaltext]"Couldyouhearme?"StephenHawkingaskedinhisiconiccomp
健康风险评估报告风险评估结果,以()和()两种方式来表达个人在未来发生某种疾病的
股票投资的净现值等于其内在价值与投资成本之( )。A.差 B.比 C.积
人工费的控制实行的方法是()。A、包干控制 B、指数控制 C、定额控制
(2014年)根据《测绘标准化工作管理办法》,下列技术要求中,应当制定测绘国家标
以欺骗、贿赂等不正当手段取得工程造价咨询企业资质的,由资质许可机关予以警告,并处
最新回复
(
0
)