She reached the top of the hill and stopped ______ on a rock by the side of the path.

A．to have rested

B．resting

C．to rest

D．rest

对临床诊断困难的急性化脓性腹膜炎最有意义检查为()

A．内镜检查

B．X线钡餐检查

C．选择性血管造影

D．同位素肝、胆、胰扫描

E．诊断性腹腔穿刺