— The fish has gone bad!

— You _____ it in the refrigerator. [ ]

A.must not have keep

B.must have kept

C.should have kept

D.should not have kept                                                                             

米力农的药理作用是

A．兴奋β受体

B．抑制cAMP降解

C．促进cAMP降解

D．促进钙离子外流

E．抑制细胞膜的钠钾泵