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
57
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] 【C18】
选项
A、guard
B、take
C、set
D、count
答案
A
解析
动词词组辨义题。前面提到“全美骨质疏松症基金会建议50岁以上的成年人每天至少补充800一1000IU的维生素”,目的是“防止发生骨折”,guard against“防止,提防”符合题意。take against“反对,不喜欢”;set against“反对,使对立,使平衡”;count against“不利于”,均不符合文意,故排除。
转载请注明原文地址:https://tihaiku.com/zcyy/3466094.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
Hersmile______hersecreteventhoughshedidn’tadmitthefact.A、revealedB、rev
Oldagehasalwaysbeenthoughtofastheworstagetobe;butitisnot【B1】
西藏地处中国西南部。它北邻青海省,东接四川省和云南省,南面和西面与印度接壤。13世纪中叶,它被正式纳入中国元代版图(domain)。尽管中国历经多次改朝
Anewhigh-performancecontactlensunderdevelopmentatthedepartmentfor
消防工程以“组”为单位的有( )。A.湿式报警装置 B.压力表安装 C.末
甲状腺机能亢进症手术治疗前,药物准备的方法有:()A.先用硫脲类药物后改用碘
能够从上述资料中推出的是______。A.2017-2019年,每年
根据下列资料回答问题。 以下为某省的人口失业率图表。其中,黑色部分表示该省全省
恩格斯指出:“动物仅仅利用外部自然界,简单地通过自身的存在在自然界中引起变化;而
互斥型投资方案经济效果评价可采用的静态分析方法有()。A:最小公倍数法 B:增
最新回复
(
0
)