2. 外语
  3. Your muscles are working to move a weight when you are ______. When you are starving, proteins can also be broken down into

Your muscles are working to move a weight when you are ______. When you are starving, proteins can also be broken down into

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问题  Your muscles are working to move a weight when you are ______.
  When you are starving, proteins can also be broken down into
选项
答案amino acids。
解析 根据题干信息词starving，proteins定位到第五个小标题下的最后一段第二句In extreme cases (like starvation)，proteins can also be broken down into amino acids，根据文章表述，有氧呼吸也可以利用源于肌肉和身体中所存脂肪的脂肪酸来生产ATP，某些极端的情况下(比如饥饿)，蛋白质能够分解成氨基酸并用来生产ATP，由此可以推断，在饥饿这种极端情况下，蛋白质可以分解为氨基酸(amino acids)。
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大学英语四级

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