_____around the Water Cube, we were then taken to see the Bird’s Nest .

A．Having shown

B．To be shown

C．Having been shown

D．To show

提高运输合理化的最主要的措施是______。

A．提高运输工具实载率

B．提高运输工具使用率

C．减少运输时间

D．减少运输费用