题目

__________ the newspaper is!A.How useful B.How a useful C.What useful D.What a useful 答案：【答案】A【解析】句意：报纸多有用啊！根据名词newspaper是可数名词，有两种感叹句的说法1.What a useful newspaper it is!2.How useful the newspaper is!可知，此空应填How useful，故选A。·若数据3，2，m，5，9，n的平均数为3，那么m和n的平均数是