Your usual teacher has lost his voice and________I am taking his place today.

A．nevertheless

B．however

C．moreover

D．accordingly

当有封闭内院或天井的建筑沿街时，应设有连通街道和内院的人行通道，通道之间的距离不宜超过（）米。

A.150

B.220

C.80

D.160