When talking about children’s education, the three Rs are the basic skills of reading, writing, and arithmetic.
N-PLURAL : the N
When talking about children’s education, the three Rs are the basic skills of reading, writing, and arithmetic.
N-PLURAL : the N
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006