婴幼儿发生佝偻病的主要原因有
A.日光照射不足
B.维生素D摄入不足
C.维生素D吸收障碍
D.钙、磷摄入不足
E.钙、磷、维生素D的需求增加
正确答案是ABCDE
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Passage 3 Questions 11 to 15 are based on the following passage. Let us think about what situations people usually see as stressful. I will not touch on health issues, job loss, divorce, and other similar situations