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
2024-04-02
57
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:http://tihaiku.com/zcyy/3537725.html
相关试题推荐
[originaltext]Well,forthoseofyouwhohaveseenthepictureinthelittl
[originaltext]Well,forthoseofyouwhohaveseenthepictureinthelittl
[originaltext]Well,forthoseofyouwhohaveseenthepictureinthelittl
[originaltext]IrunadesignstudioinNewYork.Everysevenyears,Iclose
[originaltext]IrunadesignstudioinNewYork.Everysevenyears,Iclose
[originaltext]IrunadesignstudioinNewYork.Everysevenyears,Iclose
[originaltext]AcoupleofweeksagomynephewwentabroadonhispostAlev
[originaltext]Goodevening.YouarelisteningtoPopWorldofBCDInternati
[originaltext]M:Hi,Janet,wherewereyouatlunchtime?Iwassavingaseatf
[originaltext]M:Hi,Janet,wherewereyouatlunchtime?Iwassavingaseatf
随机试题
说明:假定你叫王琳,根据下列内容写一封求职信。写信日期:2010年12月19日内容:1.从2010年12月lO日《中国日报》上获悉BAC公司招聘办公室秘书职
[originaltext]W:Thisfoodisterrible!Ican’tevenfinishmydinner.M:Ikn
[originaltext]Overthepastsixweeks,Nicky,42,hascutherdailyroutine
Therewasatimewhenbig-leagueuniversitypresidentsreallymattered.The
生产物资的采购、进货运输从属于()。A.生产物流 B.供应物流 C.场内物
下面内容是某中学教师的教学活动片段: 师:大家还记得二七大罢工失败的教训是什么
设计成果评审中,对功能性的要求内容有( )。A:建设规模、生产能力、产品方案、
阅读下面的问题,按要求回答问题。 岳桦 任林举 第一次去长白山
联合国人居中心根据《我们共同的未来》和相关的国际文献,在1996年的全球人类居住
黄河公司是一家零售商,2×21年10月18日,黄河公司向甲公司销售A产品2000
最新回复
(
0
)