参考答案

正确答案：A
解析：本题考查推断能力。第二段第五句：Recently Sada Yoko and Oto Kawakami，who learned a good deal in their foreign travels，introduced the comparatively short evening performance of three or four hours，an innovation which was at once welcomed by the better class of people．句意如下：最近，Sada Yoko和Oto Kawakami在国外旅行中学了很多东西，引进了三到四个小时的相对较短的夜场表演，这种创新很快受到日本中上层人士的青睐。据此推断，可知最显著的区别就是表演时间不同，所以A项符合题意。