后踢腿跳时,支撑腿保持弹性,两腿并拢,脚跟靠近()。
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足跟侧点地时支撑腿始终保持(),并且随动作有弹性的屈伸。
开合跳时,膝关节沿脚尖方向屈,膝关节夹角不得小于()度。
What other thing were invented in ancient China _______ the compass(指南针)?
A. except
B. apart for
C. except for
D. besides
The telephone, which _______ by Bell in 1876, was a great improvement on the telegraph.
A. wasinvented
B. has invented
C. has been invented