---It seems that my friends don’t understand me.

--- Don’t worry. I’m sure you will _________ them if you are really friendly to them.

A．agree with

B．catch up with

C．get on well with

D．be fed up with

二重感染是指

A．两种或多种细菌引起的感染

B．两种或多种致病微生物引起的感染

C．特殊厌氧菌引起的感染

D．使用抗生素后由耐药菌株引起的感染

E．结核菌感染继发化脓菌感染