某患者害怕单独到百货商场、超市和一些其他大型商场购物，一进这些场所，就会感到胸闷、出冷汗，所以一直回避这些场所。心理医生详尽地了解了病人焦虑的场合和回避的程度，制定了一张等级表进行分级暴露，这种治疗方法为

A．快速暴露法
B．自控技术
C．行为塑造法
D．系统脱敏法
E．厌恶疗法

Under a seller agreement，formal，written correspondence with the seller is required when______．

A．change to the project is issued

B．meeting with the seller's management is held

C．seller is asked for supporting information

D．there is a follow up to a conversation