下列所列举的物体，与圆柱的形状类似的是（　　）

A．乒乓球

B．字典

C．易拉罐

D．削好的铅笔尖头

句型转换

1. You can't make a noise in the classroom（改为祈使句）      

                  a noise in the classroom.    

2. Run in the classroom（改为否定祈使句）     

                 in the classroom.    

3. Don't fight in school.（改为同义句）      

                   in school.    

4. He has to wear a school uniform at school.(改为一般问句）      

           He        to wear a school uniform at school?    

5. We can eat in the classroom.（改为否定句）      

We           eat in the classroom.