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【简答题】
人体的运动，离不开()的相互作用。骨骼起着杠杆的作用，关节是运动的枢纽，肌肉收缩是运动的动力。
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相关题目：
【单选题】Who was Tony?
A.
He might be an air-courier company clerk ( 职员 ).
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He might be an airline official.
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He might be Brian’s customer.
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