---- What ________ great fun it would be if we could light candles to celebrate his birthday!

---- Forget it! The teacher in ________ charge of our dorm won’t be happy to see that.

A．/; /

B．/; the

C．a; the

D．a; /

对病毒最为敏感的细胞是（）

A.原代细胞

B.次代细胞

C.二倍体细胞

D.传代细胞

E.肿瘤细胞