跳换步，即换势，由标准实战式开始，两脚同时蹬地使身体（），空中交换两脚，同时转体更换姿势。
A、高高跃起
B、略离地面
C、A和B皆可
参考答案：B
热带雨林主要分布在 。世界上一片热带雨林气候区分布在南美洲的 。
Liu Xiang ________ his experience during the World Track and Field Events when being
interviewed by Reuters.[ ]
A. spoke to
B. referred to
C. contributed to
D. talked to
