This article is mainly about how to keep healthy through food and exercises. If you find it difficult to include enough calciu

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问题  This article is mainly about how to keep healthy through food and exercises.
  If you find it difficult to include enough calcium in your diet, ________.

选项

答案ask your doctor about supplements。

解析 根据题干中的信息词enough calcium 和 diet定位到文章最后一段首句,可得答案。
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