____ the distance was too far and the time was short, we decided to fly there instead of going there by train.

A．Discovering

B．To discover

C．To have discovered

D．Discovered

工程造价信息需要保持一定的新鲜度，这体现了工程造价信息的( )特点。

A．季节性

B．多样性

C．系统性

D．动态性