newspaper为可数名词，The newspapers were full of lies. 报纸上一片谎言。

A newspaper is a publication. 报纸是一种出版物。若不是将 newspaper 当作是供阅读或传递信息的一种东西，而只是把它当成一种“纸”来看待，也可用作不可数名词，如：Wrap it in (a sheet of) newspaper. 把它用张报纸包起来。