No matter how I tried to read it , the sentence didn’t       to me .

A．make out

B．make up

C．make sense

D．make a difference

确定某种动物疫病封锁期长短的重要依据是　　

A．最长潜伏期

B．最短潜伏期

C．平均潜伏期

D．传染期

E．转归期