—I’ve got the invitation to your school，Mr Johnson.        

—Oh，good.________.

A．How do you like it?

B．Have you read it?

C．Can you come?

D．May I help you?

下列生物除哪种外都是由细胞构成的 [ ]

A．草履虫

B．烟草花叶病毒

C．海带

D．向日葵