There's( ) on the table.A.an orange and a bowl of rice B.no

选A,there be结构的单复数取决于其后所接的人或物的单复数,且适用就近原则,即紧接there be 之后的第一个名词若为单数,则be动词用单数,若there be之后第一个名词为复数,则be动词用单数.
eg：There is a pen and two books on the desk.
There are two books and a pen on the desk.