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!