行为演练的基本方法包括_____、_____和_____。
参考答案：全身松弛训练，系统脱敏法，肯定性训练
With so many people ____ in English every day, it will become more and more important to have ____ English.
A．communicated, good knowledge of
B．communicating, a good knowledge of
C．communicating good knowledge
D．to communicate, a good knowledge at
氢冷发电机必须接好固定的压缩空气管，以便机内气体置换时用。（）
