The greatest risk for rickets is in______breastfed infants who are not supplemented with 400 IU of Vitamin D a day.

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问题 The greatest risk for rickets is in______breastfed infants who are not supplemented with 400 IU of Vitamin D a day.

选项 A、exceptionally
B、practically
C、exclusively
D、proportionately

答案C

解析 题意:单独的母乳喂养的婴儿,若每天未能补充400国际单位的维生素D,则其最易患上偻佝病。exceptionally“特别地”;practically“实际地”;exclusively“排外地,独占地”:proportionately“成比例地”。根据题意,正确答案为C。
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