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【单选题】4.白鹤亮翅，跟步抱球时重心应在什么位置（ ） In the movement of White Crane Spreads its Wings, where should the center of gravity be when holding the ball with following up step ( )
A.
后腿 hind leg
B.
不知道unaware
C.
两腿之间 between legs
D.
前腿 front leg