In this passage, the author's tone and attitude towards the design and accomplishment of the Sydney Opera House is ______.

D
解析：态度题。从全文看，作者对丹麦设计家约恩·乌特松在设计悉尼歌剧院中的独创思想是很肯定的，言辞话语之间充满着敬佩之情，称他为the mother and father of all modern landmark buildings，又称悉尼歌剧院为the single best-known modern building in the world。D与文意一致。