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
2023-08-10
53
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、200.
B、400.
C、600.
D、800.
答案
C
解析
短文在最后提到,到70岁时每天需要400国际单位(IU)的维生素D,71岁及以上的人就需要600IU。题目问80岁的老人,故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/2914418.html
相关试题推荐
抗病力强strongdiseaseresistance
强身健体makepeoplestrongandhealthy
强劲增长robust/stronggrowth
[originaltext]Objectsthatarevibratingmakesounds.Rhythmicsoundvibrations
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,two-and-th
[originaltext]Easterisamixofthreetraditions:Pagan,HebrewandChristian.
[originaltext]Easterisamixofthreetraditions:Pagan,HebrewandChristian.
[originaltext]Easterisamixofthreetraditions:Pagan,HebrewandChristian.
随机试题
Areyougoingtofixthecaryourself,orareyougoingtohaveit______?A、fixi
Thereare10blanksinthepassage.Usethewords(phrases)giveninthebox
[originaltext]W:Hi,thisisJane.We’rebackfromtheholiday.Comeoverandv
制定健康教育计划时,确定优先项目应遵循的原则包括重要性原则和()。
安静状态下,成人脑血流量占心排出量的多少A.5% B.20% C.10%
气体的分压是指A.混合气体中某一种气体的压力 B.空气的压力 C.混合气体的
地陪不能一同住在饭店时,应将自己的联系方式告知()A:领队 B:全陪 C:旅
某二级公路,其中一段路堤通过湖塘一角,长度51m,该路段地基软土厚度0.5m左右
房地产抵押贷款中,商业银行与借款人签订的房地产抵押合同,属于( )。A、单务
以下哪种因素与牙周病关系不大A.银汞合金充填物有悬突 B.牙齿排列不齐 C.
最新回复
(
0
)