________ around the Water Cube, we were then taken to see the Beijing National Stadium,  known as the Bird’s Nest。

A．Having shown

B．To be shown

C．Having been shown

D．To show

生态社会和谐包括（）。

A.社会生态和谐

B.自然生态和谐

C.社会与自然的生态和谐

D.人与自然的生态和谐