嫁接能否成功的关键是（　　）

A．接穗和砧木的形成层是否对齐，并结合紧密

B．接穗和砧木的输导组织是否结合紧密

C．接穗和砧木的木质部是否结合紧密

D．接穗和砧木的树皮是否结合紧密

Though they were in the mountain area,they were well           about the world by watching TV. [ ]

A.told

B.said    

C.spoken

D.informed