Studies in these years have found that vitamin D may also have other uses. If someone is short of vitamin D, he may have heart problems or die from some cancers.
The easiest way to get vitamin D is from sunlight .But many people worry about getting skin cancer and skin damage from the sun. Also, even skin color has an influence. Darker skinned people get less vitamin D than lighter skinned people. Older people get less vitamin D than younger people. You can also get it from foods. Some food such as cheese and egg yolks (蛋黄) have some vitamin D.But most of vitamin D in the American diet comes from food like milk with the vitamin added.
Now more doctors are testing for vitamin D in their patients. But some doctors worry that if people take too much vitamin D, it might be bad for their body.At the same time, skin doctors tell people to be careful with sunlight.
【解题导语】 本文以维生素D为线索,介绍了人体缺少这种维生素的话会导致疾病的发生,同时也谈到了如何获取维生素D。通过短文也能看出,过多的维生素D对人体是有害的。
21.What does the underlined word “osteoporosis” in Paragraph 2 mean?
A.The bones and muscles grow strong and healthy.
B.The bones become hard,but muscles become weak.
C.The muscles become narrow.
D.The bones become tender, and thin.
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