I ordered a pizza and        salad. The pizza was nice but        salad was terrible.

A．不填；the

B．the; the

C．a; 不填

D．a; a

心室肌细胞动作电位复极化1期形成的机制是（）。

A．K⁺外流

B．Na⁺内流

C．Cl^-内流

D．Ca²⁺内流

E．K⁺内流