2. 外语
  3. Because adults have reached full growth, they probably__________. One good way to get vitamin D is to__________.

Because adults have reached full growth, they probably__________. One good way to get vitamin D is to__________.

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问题 Because adults have reached full growth, they probably__________.
One good way to get vitamin D is to__________.
选项 A、sleep with your windows open
B、play in the sunshine
C、eat plenty of fresh vegetables
D、take some medicine
答案B
解析 从文章第二段第二句：It forms when the skin is exposed to the sun．得知。故本题答案为B。
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