In the introduction,don't forget to greet the _______ and introduce yourself.
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Telling them that you _____ their questions anytime during your presestation.
Finally, close your production ______briefly.
学习排球首先应学习的是（ ）技术。
A. 移动
B. 垫球
C. 准备姿势
D. 发球
排球半蹲准备姿势，身体重心的着力点在（ ）在。
A. 前脚掌拇指根部
B. 全脚掌上
C. 脚后跟上
D. 两腿中间
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