The nurse teaches a mother how to provide adequate nutrition for her toddler, who has cerebral palsy. Which of the following observations indicates that teaching has been effective ？（）

A．The toddler stays neat while eating.

B．The toddler finishes the meal within a specified period of time.

C．The child lies down to rest after eating.

D．The child eats finger foods by himself.

运动员百米赛跑途中突然闻及左膝撕裂声，然后倒地，查体左膝不能主动伸，x线片显示髌骨中断段折，考虑造成骨折的原因是

A．直接暴力

B．间接暴力

C．病理性骨折

D．肌肉拉力

E．积累性劳损