Every minute must be made full use of __ our lessons, for the college entrance exam is coming.[ ]

A. going over  

B. to go over    

C. go over    

D. our going over

下列交通运输工具中，在第一次工业革命时期发明创造的有(     )

A．火车

B．汽车

C．汽船

D．飞机