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
2023-08-23
91
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, and six hundred for those seventy-one and older. But some groups say these amounts are not high enough.
16. According to the speaker, what is the easiest way to get Vitamin D?
17. According to the speaker, who produces the most Vitamin D?
18. What do some experts worry about?
19. 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/2951824.html
相关试题推荐
[originaltext]Howoftenonehearschildrenwishingtheyweregrown-ups,and
[originaltext]Peopleallovertheworldtodayarebeginningtohearandlea
[originaltext]Peopleallovertheworldtodayarebeginningtohearandlea
[originaltext]W:Why?Peter?Youlookunhappy.M:Ilostmytemperatanoldma
[originaltext]W:Why?Peter?Youlookunhappy.M:Ilostmytemperatanoldma
[originaltext]M:Well!Howdiditgo,sweetheart?W:Notsowell.M:Oh,God!T
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
[originaltext]M:Congratulations!Ijustheardaboutyouracceptanceintolaws
随机试题
Einstein’stheoryofrelativityseemedhardtobelieveatthetime______.A、when
[originaltext]M:Hey,Amanda!Howcomeyou’rewearingasuit?I’veneverseeny
检算在用桥梁结构或构件承载能力极限状态评定的内容包括()。A.强度 B.
患者女性,40岁,44舌侧尖斜形折断2天,松动,颊侧半稳。叩诊轻度不适,牙冠稍短
哪部医学著作将呃逆分为外感、内伤两大类A.《景岳全书》 B.《症因脉治》 C
案例八: 一般资料:求助者,男性,58岁。 案例介绍:求助者退休前是公交车司
下列企业人力资源计划类型中,将目标定为改善员工知识技能和工作作风的是( )。A
根据企业国有资产法律制度的规定,下列关于我国企业国有资产监督管理体制的表述中,正
根据企业破产法律制度的规定,下列有关债权申报的表述中,正确的是()。A.破产申
采取托收承付和委托银行收款方式销售货物,其增值税纳税义务发生时间为收到货款的当天
最新回复
(
0
)