2. 外语
  3. Your muscles are working to move a weight when you are ______. The body has several different systems to create ______, becaus

Your muscles are working to move a weight when you are ______. The body has several different systems to create ______, becaus

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问题  Your muscles are working to move a weight when you are ______.
  The body has several different systems to create ______, because it is very important.
选项 A、AMP
B、ATP
C、ADP
D、phosphate molecule
答案C
解析 根据题干信息词different systems定位到第二个小标题下的倒数第二段第一句Because ATP is so important，the body has several different systems to create ATP，可知因为ATP很重要，身体里有几个不同的系统来制造ATP，题干中的“it”即指ATP，故本题选C。
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大学英语四级

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