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

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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