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
2023-08-13
41
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,[12]and six hundred for those seventy-one and older. But some groups say these amounts are not high enough.
9 According to the speaker, what is the easiest way to get Vitamin D?
10 According to the speaker, who produces the most Vitamin D?
11 What do some experts worry about?
12 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/2921463.html
相关试题推荐
[originaltext](16)TheUShousingsectorusuallyleadstherestoftheecon
[originaltext]Sleepapneaisacommondisorderinwhichyouhaveoneormor
[originaltext]Sleepapneaisacommondisorderinwhichyouhaveoneormor
[originaltext]Sleepapneaisacommondisorderinwhichyouhaveoneormor
[originaltext]M:Excuseme,Iwonderifyoucouldhelpme?W:Ofcourse.Howca
[originaltext]M:Excuseme,Iwonderifyoucouldhelpme?W:Ofcourse.Howca
[originaltext]M:Hi,Lesley!DidyougototheKentCentretovotelastweek?W
[originaltext]M:Hi,Lesley!DidyougototheKentCentretovotelastweek?W
[originaltext]M:Hi,Lesley!DidyougototheKentCentretovotelastweek?W
[originaltext]TheheadoftheUScentralbankhastoldCongressthattheec
随机试题
______(要不是他们救了我们),wewouldhavebeendrownedinthecoldriver.Iftheyhadn’t
LivingDunesWhenyouthinkofasanddune,youprobablypictureabarrenpileo
TheHistoryofChineseAmericans[A]Chinesehavebee
A.1或-2 B.1或-1 C.0或-2 D.-2
根据题目要求完成下列任务,用中文作答。 简述教师在组织小组活动(groupw
关于注册测绘师在一个注册期内接受继续教育学时的说法,正确的是()A:必修课60学
下列不属于财产保险合同的是()。A、财产损失保险合同B、健康保险合同C、责任
影响气道阻力最重要的因素是A.气流速度 B.气流形式 C.呼吸时相 D.呼
1000MW定子的吊装方案中通常采用( )吊装。A.吊车组合 B.专用吊装架
扑翼样震颤见于( )。A.甲状腺功能亢进症 B.震颤性麻痹 C.肝性脑病
最新回复
(
0
)