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答案：
A
leptin是一
A.对，消化系统会在蛋白质进入血液之前把它分解掉，他因来解释，说明leptin做饮食补充不会发挥有效性。
B.是否有Pharmaceuticals能减重，无关。
C.low levels of leptin会有high percentage of body fat， 方向一致，不能说明为啥饮食不行。
D.老鼠是啥品种，无关。
E.注射leptin，老鼠会减重，没说明为啥饮食不行。
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