In the Oral Approach, Palmer insisted that there was a basic difference between the spontaneous capacities of human beings to ______ language naturally and unconsciously and the trained or"situational" capacities of the classroom learner which allowed him to learn language consciously.

胆囊切除术的手术指征不包括（）。

A.胆囊结石反复发作引起临床症状

B.嵌顿在胆囊颈部或胆囊管处的胆囊结石

C.慢性胆囊炎致胆囊萎缩

D.胆囊内充满结石

E.无症状的单发胆囊结石