I couldn’t remember the exact date of the storm, but I knew it was ________ Sunday because we were on ________ field trip.

A．a; a

B．the; the

C．the; a

D．a; the

虫媒病毒的共同特征不包括（）。

A.致病有明显的季节性和地方性

B.核酸为DNA

C.不耐酸

D.宿主范围广

E.通过节肢动物传播