一I’we heard that another brand of milk powder has been banned .

－It’s a shame that some companies lack the sense of social responsibility and       ．

A．consequence

B．construction

C．consideration

D．conscience

下列药物的前体药为伐昔洛韦的是（）

A.泛昔洛韦

B.喷昔洛韦

C.阿昔洛韦

D.齐多夫定

E.利巴韦林