40.Margaret Rood依發展順序,將動作發展歸於四個階段,其第三階段的動作特徵為何?
(A)在穩定肢體上練習動作(practice movement imposed on stabilization)
(B)技巧性動作(skilled movement)
(C)重複地練習相位性的交互收縮(phasic reciprocal contraction)
(D)主要肌肉群的共同收縮(stabilization through contraction of major muscle groups)