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
2023-08-17
15
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、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://www.tihaiku.com/zcyy/2933651.html
相关试题推荐
[originaltext]Ifyou’recarefulenough,you’llfindthatitiscommonnowad
[originaltext]InBritainthebiggestnumberofworkingforeignerscomesfro
[originaltext]InBritainthebiggestnumberofworkingforeignerscomesfro
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
随机试题
Sometimeinthemiddleofthe15thcentury,awell-to-domerchantfromLondo
[originaltext]W:Hi!IseeyouarehavingfunwithyournewcomputerandIntern
某企业在确定产品产量指标时采取盈亏平衡分析法,盈亏平衡示意图如图所示。该企业20
闭合水准路线闭合差的限差值和水准路线的长度( )。A.无关,和高差大小有关
审贷分离是指将信贷业务全过程分解为调查、审查、审批、用信、贷后管理、不良资产处置
( )是在关键事件法的基础上发展起来的,与行为锚定等级评价法大体接近,只是在量
简述现代企业人力资源管理各个历史发展阶段的特点。
下列()不属于汇率风险。A.国际收支 B.通货膨胀率 C.投机冲击 D.期
重新计量其他长期职工福利净负债或净资产所产生的变动计入其他综合收益。()
垫隔、覆盖土工布处理基底法在( )会收到较好的效果。A.软土、沼泽地区 B.地
最新回复
(
0
)