If you want to start your own photographing company, you’d employ someone who knows _____, which can contribute to the success of your business.      [ ]

A. the tricks of the trade    

B. the trades of the trick  

C. the tricks of trade

D. tricks of the trade

负债是指企业过去的交易或者事项形成的，预期会导致经济利益流出企业的（）。

A．现时义务

B．潜在义务

C．过去义务

D．未来义务