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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

标签：工程英语口语

上一条：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.

下一条：Gestures mainly mean the movements of one's hands and（）， the head and shoulders, or even the legs and feet.