题目内容：
What can we learn from the passage?
A．Tracers believe long-term effective practice Call help avoid injuries． B．Beginners should train their endurance above all．
C．All parkour participators pay less attention to their safety．
D．Large drops are the most difficult techniques of parkour．
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：