单选题
One good way to get vitamin D is to__________.
A、
sleep with your windows open
B、
play in the sunshine
C、
eat plenty of fresh vegetables
D、
take some medicine
【正确答案】
B
【答案解析】
[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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