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
39
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、From meat
B、From milk
C、From eggs.
D、From sunshine.
答案
D
解析
短文一开始就提到了the easiest way to get vitamin D,即“从阳光中获取维生素D”。故选D。
转载请注明原文地址:https://tihaiku.com/zcyy/2921462.html
相关试题推荐
[originaltext]Everybodytalksabouthappinessthesedays.Ihadsomebodyco
[originaltext]Manycollegestudentshavegivenuptakingclassnotesbyhan
[originaltext]Manycollegestudentshavegivenuptakingclassnotesbyhan
[originaltext]Moderator:Helloeverybody,Iamhappytointroduceourrespe
[originaltext](12)AnewprogramcalledAdelanTECHLeadershipishelpings
[originaltext](12)AnewprogramcalledAdelanTECHLeadershipishelpings
[originaltext](12)AnewprogramcalledAdelanTECHLeadershipishelpings
[originaltext]Imaginehackersstealingtopsecretfilesfromamilitarybas
[originaltext]M:Shakinganinfantoutofangerorfrustrationcanleadtoseve
[originaltext]M:Shakinganinfantoutofangerorfrustrationcanleadtoseve
随机试题
Whatmightdrivingonanautomatedhighwaybelike?Theanswerdependsonwh
[originaltext]M:Helloandwelcometoourprogram,"WorkingAbroad".Ourguest
在军事体育训练交流会上,有的战士谈到:“基础体能考核项目里,难度最大的是引体向上
以下叙述中,处方审核结果可判为超常处方的是A.字迹难以辨认 B.联合用药不适宜
A.与GABA受体亚单位结合 B.增强GABA能神经传递和突触抑制 C.减慢
产业转移可以分为扩张性产业转移与撤退性产业转移。扩张性产业转移是指产业在其原地区
肾衰竭少尿期的患者补液时,液量供给的参考指标不正确的是A.体重每天减轻0.5kg
下列关于痢疾杆菌,正确的是A.分为3群 B.专性厌氧 C.有鞭毛 D.可产
2000-131.疝的病因有 A.肝郁B.久立远行C.气虚D.湿热
前牙运动循环的功能阶段是A.切牙对刃并滑回至正中 B.下颌前伸 C.下颌下降
最新回复
(
0
)