2. 外语
  3. Your muscles are working to move a weight when you are ______. When you start running, the muscle cells burn off the ATP they

Your muscles are working to move a weight when you are ______. When you start running, the muscle cells burn off the ATP they

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问题  Your muscles are working to move a weight when you are ______.
  When you start running, the muscle cells burn off the ATP they have floating around in
选项
答案about 3 seconds。
解析 根据题干信息词start running，burn off定位到第六个小标题下的第一段和第二段…you start running．．．The muscle cells．．．in about 3 seconds，根据文章表述，当你开始跑步时，肌肉细胞首先在三秒钟内(about 3 seconds)燃烧掉原本容纳在内的ATP，在此之后若是依然持续运动，肌肉再利用其他系统消耗ATP。
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大学英语四级

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