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
14
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] 【C12】
选项
A、exceedingly
B、excessively
C、extraordinarily
D、efficiently
答案
D
解析
副词辨义题。根据常识可知,老年人借助日光合成维生素D的能力肯定弱于年轻人,故本句意为“皮肤黝黑者和老年人借助日光合成维生素D的能力弱于年轻人和肤色较浅的人”,efficiently“有效地,效率高地”符合题意。exceedingly“非常,极其”;excessively“过分地,极度”;extraordinarily“非常,格外,非凡地”,均不符合文意,故排除。
转载请注明原文地址:https://tihaiku.com/zcyy/3466088.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
InthemonthofSeptember,inBritain,youmayseelargenumbersofbirds【C1
PolitebehaviorisimportantintheAustraliansociety."Please"and"thank
已知某带权图G的邻接表如下所示,其中表结点的结构为: 则图G是()
产生抗体的细胞是:A.T细胞 B细胞 C.自然杀伤细胞 D.浆细胞
信息系统集成公司A(以下简称A公司)于2012年5月承接了某市级银行的计费数据库
针对当前中小企业普遍遭遇的“融资难”“自主创新难”“公平待遇难”等问题,人民政协
鲁迅先生在民国十四年曾经说过:“我觉得革命以前,我是做奴隶,革命以后不多久,就受
建设单位应当将大型的人员密集场所和其他特殊建筑工程的消防设计文件报送公安机关消防
(2013年真题)某市政府征收辖区内某村的部分集体土地用于建造港口。该村村民孙某
对于混凝土重力坝坝体的防渗与排水设施,下面说法正确的是()。A.多采用一层
最新回复
(
0
)