there is (a soccer ball and a basketball) on the floor.括号提问
问题描述：
there is (a soccer ball and a basketball) on the floor.括号提问
_____ _____ _____ on the floor
答
What is on the floor?
记住,无论是什么,只要是对表语（be动词后）提问,都用What is,不能用别的