Classify the. following groups of people according to whether they believe A.Supplementation may have a positive effect. B

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问题 Classify the. following groups of people according to whether they believe    A.Supplementation may have a positive effect.    B.Supplementation may have a negative effect.    C.Supplementation has no effect.    Write the correct letter A, B or C, in boxes 22-26 on your answer sheet.  
National Institutes of Health

选项 A、 
B、 
C、 

答案B

解析
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