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
2023-07-19
21
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] 【C9】
选项
A、distract
B、divert
C、convert
D、reform
答案
C
解析
动词辨义题。前面提到“维生素D最有效的来源足阳光中的紫外线B(UVB)”,是因为“它能将人体皮肤中的一种胆固醇转化成维生素D”。convert“使转变,转换”符合题意。distract“转移,分心”;divert“转移,使……转向”;reform“改革,革新”,均不符合文意,故排除。
转载请注明原文地址:https://tihaiku.com/zcyy/2849821.html
相关试题推荐
[originaltext]Extremelyhotweatheriscommoninmanypartsoftheworld.A
[originaltext]Extremelyhotweatheriscommoninmanypartsoftheworld.A
[originaltext]Extremelyhotweatheriscommoninmanypartsoftheworld.A
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】
随机试题
Onehundredyearsago,"Colored"wasthetypicalwayofreferringtoAmerica
行政复议机关应当自受理申请之日起()日内作出行政复议决定。A:30B:50C
有人根据某种沙门菌食物中毒患者164例的潜伏期资料,用百分位数法求得潜伏期的单侧
在全国银行间债券市场质押式回购中,具有结算代理人资格的金融机构主要有( )。
脊髓出现下列哪项改变会造成不可逆性瘫痪A、脊髓震荡 B、脊髓断裂 C、脊柱骨
(2018年11月)某装备制造公司拥有员工1500多名,其中管理人员,专业技术人
根据以下材料,回答题 一般资料:求助者,男性,40岁,外企高管。 案例介绍:
多数寒凉药不具有的药理作用是A.抑制中枢神经系统 B.降低交感神经-β受体功能
(2020年真题)企业发生经济业务需要支付现金时,可以从本单位的现金收入中直接安
关于动脉粥样硬化早期病变叙述中下列哪项正确A、中膜平滑肌细胞移入内膜形成泡沫细胞
最新回复
(
0
)