用单数,这是主谓一致原则的一条用法,and连接的两个单数名词前若用each,every,no修饰,该名词短语作主语时,谓语动词用单数形式.
例如:No book and no pen is found in the schoolbag.书包里没有书和钢笔.
Every boy and every girl likes music.
祝你学习愉快!