There is a real possibility that these animals could be frightened, ________ a sudden loud noise. [      ]

A. being there    

B. there being    

C. should there be    

D. there was

单纯性肾病的病理变化，最常见为()

A．局灶硬化型

B．膜性增殖型

C．增殖病变型

D．膜性病变型

E．微小病变型