______believes that language samples can be exhaustively described at any structural level of descriptions.

A．The Grammar-Translation Method

B．The Cognitive Approach

C．The Audiolingual Method

D．The Communicative Approach

数据库设计的4个阶段是：需求分析、概念设计、逻辑设计和( )。

A．编码设计

B．测试阶段

C．运行阶段

D．物理设计