题目内容
（请给出正确答案）
[主观题]
What can we learn about the subjects in the CALERIE study？A．They were selected by the Nati
What can we learn about the subjects in the CALERIE study？
A．They were selected by the National Institutes of Health.
B．They were divided into two groups according to their sex and age.
C．Half of them became thinner after the study.
D．They received periodical medical checks during the 6 months.
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