One of my friends asked me to help him with his lessons this weekend, and thus __ my plan.

A．ruined

B．ruining

C．to ruin

D．ruins

何某，女性，35岁。经常做梦，因此非常担心做梦会影响健康。她对做梦的认识下列哪项正确

A．是神经衰弱的表现

B．影响大脑的休息

C．不利于学习记忆

D．不利于消极情绪的发泄，保持心理平衡

E．有利于触发灵感，解决难题