非特异性免疫又称

A．适应性免疫

B．获得性免疫

C．细胞免疫

D．固有免疫

E．体液免疫

—Is Mr. Black ill?

—______. I think he will have to stay at home to have a good rest.

A．I don’t think so

B．I’m afraid not

C．I hope so

D．I’m afraid so