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Postures are the positions a person holds his body upright against （）.
Postures are the positions a person holds his body upright against （）.
正确答案：gravity
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学术交流英语
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A signal to the audience that you are ready to begin is to stand （） and quietly until you are sure that all eyes are on you.
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Gestures mainly mean the movements of one's hands and （）， the head and shoulders, or even the legs and feet.