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
2023-08-15
67
管理
问题
Vitamin D helps bones and muscles grow strong and healthy.
[9]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.
[10]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. [11]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/2927727.html
相关试题推荐
[originaltext][9]America’sholidayshoppingseasonstartsonBlackFriday,
[originaltext]W:[5]AccordingtoastudyofRaceandEquityinEducation,black
[originaltext]W:[5]AccordingtoastudyofRaceandEquityinEducation,black
[originaltext]W:[5]AccordingtoastudyofRaceandEquityinEducation,black
[originaltext]W:[5]AccordingtoastudyofRaceandEquityinEducation,black
[originaltext]W:Mr.Ishiguro,haveyoueverfoundoneofyourbooksatasecon
[originaltext]W:Mr.Ishiguro,haveyoueverfoundoneofyourbooksatasecon
[originaltext]LateinJanuary1975,[23-1]a17-year-oldGermangirlcalle
[originaltext]LateinJanuary1975,[23-1]a17-year-oldGermangirlcalle
[originaltext]The2010GlobalHungerIndexreportwasreleasedtodaybythe
随机试题
BrokenBones:Donotmovethepatient.Sendforambulanceatonce.Treatfor
自耦变压器一二次侧既有磁的联系,又有电的联系。()
如果一空调系统的用水要求是,供给5℃的冷冻水,回水温度为9℃,采用河水作冷却水源
规划阶段对规划河流或河段内的区域构造应了解主要构造单元、褶皱和断裂的类型、产状、
下列有关睛明穴针刺操作的叙述,不正确的是()A.遇到阻力时,可继续进针
心动周期中,心室容积最小的时期是A.等容收缩期末 B.快速射血期末 C.快速
以下属于货币市场子市场的有()。A.国库券市场 B.股票市场 C.债
贷款安全性调查就是银行业务人员对借款人的信用资质做出判断。()
激情的特点包括()。 (A)爆发式的(B)强烈的 (C)持续时间很长(
影响技术领先持久性的主要因素有()。A.技术的可复制性 B.技术的复杂程
最新回复
(
0
)