题目

This precious picture has been handed down to him from one   (一代) to another. 答案：【答案】generation【解析】句意：这张珍贵的照片一代一代的传给了他。from one generation to another固定短语，“一代接一代”，故填generation。若复数（i是虚数单位）的实部和虚部相等，则实数a等于     A．-1             B．           C．             D．3