—— Did you have a good time at ________ party last night?

—— Yes. I’ve never been to ______ more exciting one.

A．the; the

B．the; a

C．不填；the

D．a; a

与病原菌致病性无关的因素为（）。

A.毒力

B.细菌种类

C.侵入机体数量

D.侵入途径

E.侵袭力