报纸是可数名词，a newspaper但纸属于不可数名词 a piece of paper祝你进步！
a newspaper 就这么简单eg.给我一份报纸.Give me a newspaper.
a newspaper 绝对正确。加piece是表示一张报纸了。
a piece of news paper.Sorry,I'm not sure about this.
apieceofnewspaper
