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【OG20-P570-636題】
Which of the following most logically completes the passage?
Leptin, a protein occurring naturally in the blood, appears to regulate how much fat the body carries by speeding up the metabolism and decreasing the appetite when the body has too much fat. Mice that do not naturally produce leptin have more fat than other mice, but lose fat rapidly when they are given leptin injections. Unfortunately, however, leptin cannot be used as a dietary supplement to control fat, since_________.
A. the digestive system breaks down proteins before they can enter the bloodstream
B. there are pharmaceuticals already available that can contribute to weight loss by speeding up the metabolism
C. people with unusually low levels of leptin in their blood tend to have a high percentage of body fat
D. the mice that do not naturally produce leptin were from a specially bred strain of mice
E. mice whose bodies did produce leptin also lost some of their body fat when given leptin injections
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文字解析
leptin是一
A.對，消化系統(tǒng)會在蛋白質(zhì)進入血液之前把它分解掉，他因來解釋，說明leptin做飲食補充不會發(fā)揮有效性。
B.是否有Pharmaceuticals能減重，無關(guān)。
C.low levels of leptin會有high percentage of body fat， 方向一致，不能說明為啥飲食不行。
D.老鼠是啥品種，無關(guān)。
E.注射leptin，老鼠會減重，沒說明為啥飲食不行。
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