选出与所给句子意思相反的选项。(15分)
(　　)（1）Please stand up!
A．Please point!                    B．Please sit down!
(　　)（2）Hello，boys!
A．Goodbye，boys!                 B．Hi，boys!
(　　)（3）Look up!
A．Look here!                      B．Look down!
(　　)（4）Good morning!
A．Good afternoon!                 B．Good morning!
(　　)（5）This is Ms Smart.
A．That is Ms Smart.              B．Morning，Ms Smart!