首页
登录
职称英语
[originaltext] Vitamin D helps bones and muscles grow strong and healthy.
[originaltext] Vitamin D helps bones and muscles grow strong and healthy.
游客
2023-08-23
95
管理
问题
Vitamin D helps bones and muscles grow strong and healthy.
The easiest way to get vitamin D is from sunlight. The ultraviolet rays react with skin cells to produce the vitamin. But many people worry about skin cancer and skin damage from the sun.
Also, darker skinned people produce less vitamin D than lighter skinned people. Production also decreases in older people and those living in northern areas that get less sunlight.
Not many foods naturally contain vitamin D. Foods with high levels include oily fish such as salmon, tuna and mackerel, and fish liver oils. Boston University researchers reported last year that farmed salmon had a lot less vitamin D than wild salmon.
Small amounts of D are found in beef liver, cheese and egg. And some people take dietary supplements containing the vitamin. But most of the D in the American diet comes from foods like milk with the vitamin added.
These days, more doctors are testing for vitamin D levels in their patients. But as research continues, some experts worry that if people take too much D, it might act as a poison. Also, skin doctors warn people to be careful with sun exposure.
How much vitamin D does a healthy person need? Nutrition experts who advise the American government set the current recommendations in 1997. The daily amount is two hundred international units from birth through age 50. Then it rises to four hundred international units through age seventy, and six hundred for those seventy-one and older. But some groups say these amounts are not high enough.
16. According to the speaker, what is the easiest way to get Vitamin D?
17. According to the speaker, who produces the most Vitamin D?
18. What do some experts worry about?
19. How much Vitamin D does an 80-year-old person need every day?
选项
A、Darker skinned people.
B、Lighter skinned people.
C、The old aged people.
D、People living in the north.
答案
B
解析
短文提到,深色皮肤的人比浅色皮肤的人产生的维生素D要少,老年人和那些居住在北部地区获得阳光较少的人产生的维生素也较少。故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/2951824.html
相关试题推荐
[originaltext]Howoftenonehearschildrenwishingtheyweregrown-ups,and
[originaltext]Peopleallovertheworldtodayarebeginningtohearandlea
[originaltext]Peopleallovertheworldtodayarebeginningtohearandlea
[originaltext]W:Why?Peter?Youlookunhappy.M:Ilostmytemperatanoldma
[originaltext]W:Why?Peter?Youlookunhappy.M:Ilostmytemperatanoldma
[originaltext]M:Well!Howdiditgo,sweetheart?W:Notsowell.M:Oh,God!T
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
随机试题
Onedayin1963,adolphinnamedElvarandafamousastronomer,CarlSagan,
What’syourearliestchildhoodmemory?Canyourememberlearningtowalk?Or
以下关于制冷机房内吸、排气管道的布置叙述正确的为()。A.放在同一水平面上
营养性巨幼细胞贫血的治疗,哪一个是正确的A.首先注射维生素B B.首先口服叶酸
A.多巴胺 B.β受体阻滞剂 C.硝酸酯类 D.钙拮抗剂 E.ACEI在
按照贷款品种划分,个人贷款主要分为( )。A.个人投资贷款 B.个人住房贷款
根据《基金合同的格式和内容要求》,以下不属于基金合同应当载明的基金资产估值事项的
A.化学灭菌 B.物理灭菌法 C.消毒 D.防腐 E.除菌用物理或化学方
贵重药物临床用量是A.0.03~0.6gB.0.3~1gC.1~3gD.3~6g
腰椎间盘突出症早期的基本治疗是A.止痛药物 B.理疗 C.腰背肌锻炼 D.
最新回复
(
0
)