After the manager saw what you _____ at the table, he was sure you would not be the right person for

 the job.       [ ]

A. imagined    

B. manner

C. behaved      

D. expressed

如图所示的滚摆，从最低处向上运动的过程中，动能转化为       ，如果只有这两种能相互转化，机械能的总和        。