城市桥梁车道设计荷载由（ ）所组成。

A．一系列轴载

B．均布荷载

C．均布荷载与两个集中荷载

D．均布荷载与一个集中荷载

The visit to the parents in the countryside, originally due to be paid last Sunday, was finally ________

because of the bad weather.[ ]

A. set off    

B. called off    

C. broken off    

D. taken off