D

1. How much vitamin d does a healthy person need ?

一个健康的人到底需要多少维生素d呢？

2. Can vitamin d replace flu shots ?

维生素d可以取代流感疫苗吗？

3. Doctors are learning that vitamin d has many health benefits .

医生认识到维生素d对健康有很大的好处。

4. Teenagers are also at risk for vitamin d deficiency .

十几岁的青年人同样也受到维生素d缺乏的威胁。

5. Most vitamin d is made when skin is exposed to sunlight .

如果让皮肤晒晒日光则可以产生大量的维生素d。

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