大脑皮层上有_______中枢、_______中枢、_______中枢等神经中枢。
躯体感觉 躯体运动 语言
结构化方法的实践证明，系统隐患大多数来自于
A．需求定义阶段
B．系统设计阶段
C．系统实施阶段
D．系统维护阶段
Krashen identifies three kinds of affective variables related to second language acquisition:______.
A．motivation, self-confidence and anxiety
B．comprehension, acquisition and anxiety
C．input, competence and self-confidence
D．situation, motivation and self-confidence
