对保护帮助者的基本要求是什么？
参考答案：
①具有高度责任感；
②了解练习者的情况；
③熟悉动作技术；
④掌握扎实的保护与帮助技能。
His family was poor, but his parents _________to send him to a key middle school where he felt happy and did quite well.
A．tried
B．do try
C．did manage
D．do managed
倾销
