完成屈肘动作的正确顺序是( )
①骨骼肌收缩 ②骨受到肌肉牵拉绕着关节产生动作 ③骨骼肌接受神经传来的兴奋
A:③①②
B:②③①
C:①③②
D:②①③
把问题和答语对应起来。
A.He's from China.
B.He's my teacher.
C.No, she is old.
D.He's short and thin.
E.No, he is old.