2. 外语
  3. Leptin is effective in reducing weight but it’s many years away before humans can use it. The ob gene causes the fat cells to p

Leptin is effective in reducing weight but it’s many years away before humans can use it. The ob gene causes the fat cells to p

admin2013-06-17  23
问题 Leptin is effective in reducing weight but it’s many years away before humans can use it.
The ob gene causes the fat cells to produce the hormone leptin. The fatter, the more hormones are produced.
选项 A、Y
B、N
C、NG
答案A
解析 由文章第五段第一句“Because leptin is produced in fat tissue，the fatter an animal is，the more leptin its cells should make”可知，leptin是由脂肪细胞分泌的，老鼠越胖，分泌的leptin越多。文中用了protein(第四段第一句)和hormone(第四段第三句)来指leptin。
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大学英语四级

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