The rodent, ________the mouse, rat, guinea pig, and porcupine, are mammals with incisor-like teeth in both jaws.

A．made up

B．including

C．consisting

D．constitute

采用（）可防止生物转盘上的生物膜厚度变薄。

A.降低进水水量

B.降低进水水质

C.减少生物转盘运转段数

D.减小生物转盘直径