未成熟儿易患佝偻病的主要原因是
A.消化酶分泌不足
B.胃肠道功能不成熟
C.肝、肾功能发育不成熟
D.生长发育快,维生素D需要量大
正确答案是D
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Could you imagine your parents choosing your husband or wife for you? And can you imagine not setting eyes on him or her until your wedding day? This situation is common in India, the Middle East and many parts of Africa. Marriage c