In a Natural Approach class, which of the following is NOT an acquisition activity

A. Affective-humanistic activity.

B. Problem-solving activity.
C. Content activity.


D. Translation activity.

下列中哪项不是混凝机理（）。

A、吸附架桥作用

B、沉淀物卷扫作用

C、化学键力

D、双电层作用