题目

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡相应位置上。There are no precise 【1】 (criterion) that can be used to judge what is beautiful. As the anthropologist (人类学家) Margaret Mead once put 【2】, standards and ideas of beauty change across time. Nowadays, some costumes and actions once 【3】 (regard) as beauty in the 19th century are not considered healthy or attractive, while something 【4】 (fashion) now had different 学校计划购买一批完全相同的正多边形地砖铺地面，不能进行镶嵌的是（　　）A．正三角形B．正四边形C．正五边形D．正六边形