[单项选择]

Get Right Amount of Vitamin D

Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin D can lead to problems like rickets and osteoporosis. Rickets is a deformity mainly found in children. Osteoporosis is the thinning of bone, a common problem as people, especially women, get older. Studies in recent years have suggested that vitamin D may also have other uses. Studies have shown that low levels of D may increase the risk of heart attacks in men and deaths from some cancers. Other studies have shown that people with rheumatic diseases often have low levels of D.
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
A. Tuna and mackerel.
B. Fish liver oils.
C. Beef liver.
D. Milk with the vitamin adde

最新试题

• ●    针对人民群众反映强烈的食品安全问题，为维护人民群众生命健康权，全国人大常委会通过的刑法修正案加重了对
• ●    以下关于现场检查的理解，不正确的是（）。
• ●    [单选题]大体积混凝土施工如采用表面振捣,分层厚度不应超过( )。
• ●    [单选题]已终结的工作票、事故紧急抢修单应保存( )。
• ●    [多选题]调整哨应当设置在便于（）的位置
• ●    保险代理从业人员向客户推荐的保险产品，下列做法不正确的是（）。