2. 外语
  3. Leptin is effective in reducing weight but it’s many years away before humans can use it. If excess leptin is present, the brai

Leptin is effective in reducing weight but it’s many years away before humans can use it. If excess leptin is present, the brai

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问题 Leptin is effective in reducing weight but it’s many years away before humans can use it.
If excess leptin is present, the brain signals the body to increase food intake and to become more active.
选项 A、Y
B、N
C、NG
答案B
解析 本文第四段的倒数第二句话：Thus when leptin is low，hunger pangs increase．．．when leptin is high，everything reverses．当动物体内的leptin水平较低时，因饥饿引起的胃痛加剧，体温下降，新陈代谢趋缓；而leptin水平高时，情况正相反。因此本题表述的正是lepfin水平较低时的情况。
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大学英语四级

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