This study shows that ______language may differ，the order in which young kids learn the parts of speech appears to be the same across different languages.

A．since

B．so

C．while

D．but

空腔脏器破裂时最主要的体征是（）

A.腹部出现移动性浊音

B.腹膜刺激征

C.腹式呼吸消失

D.肠鸣音消失

E.肝浊音界消失