积块软而不坚，固着不移，胀痛并见，舌苔薄，脉弦，治宜选用
A．六磨汤B．逍遥散C．金钤子散和失笑散D．膈下逐瘀汤E．八珍汤合化积丸
参考答案：C
According to some functional linguists, some utterance has no meaning at all if it is out of the context of ______.
内源性痛觉抑制性调制系统
