A poet and artist_______coming to speak to us about Chinese literature and painting tomorrow afternoon．

A.纯钢结构比钢筋混凝土结构差
B.钢筋混凝土结构比纯钢结构差
C.砖石结构比纯钢结构差
D.钢筋混凝土结构与纯钢结构相似

A.whichever
B.however
C.whatever
D.whoever

A．错误
B．正确