What is on the desk?是用It is a book回答,还是There is a book

There's a book。小学英语中有一个重点练习项目---What's +在某地?----There be 。理解请赞同!There's a bookpotatoes [pəˈteitəuz] apples [ˈæplz] vegetables [ˈvedʒitəblz] drinks [driŋks] 再问： 那翻译呢 再答： potatoes [pəˈteitəuz] 土豆 apples [ˈæplz] 苹果 vegetables [ˈvedʒitəblz] 蔬菜 drinks [driŋks]饮料再问： 不是这个 是There is a book 再答： What is on the desk？桌子上有什么？ There is a book （桌子上） 有一本书。