This is a book ( ) radio A.on B.about 应该选哪个?（注：答案上说应该选A,为什么?）

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This is a book ( ) radio A.on B.about 应该选哪个?（注：答案上说应该选A,为什么?）
This is a book ( ) radio A.on B.about 应该选哪个?（注：答案上说应该选A,为什么?）

This is a book ( ) radio A.on B.about 应该选哪个?（注：答案上说应该选A,为什么?）
答：出题者自己可能都没有注意到,这里的radio前没有冠词,则为抽象名词,是“无线电”,用on表示“论述”,用about表示“关于”.如果表示：有一本关于无线电的书,则用B较好.
如果表示“在收音机上有一本书”,则是：There is a book on the radio.
答案是A,可能是想表达这个意思,但谁不小心漏掉了一个定冠词the
请检查确认一下.

on与about 二者都是介词，意为“关于，论及”等，一般情况下，二者可以互相替换，但二者有点区别：on表关于时指关于某一个特定的主题。这里表示这本书是关于radio的专业书籍

This is a book Is this a book? Yes,this is. This is s book.(a book提问) This is a book答语 This is a book.对a book进行提问 This is a book 改为复数句 This is a interesting book.找错误! this is a book改为复数形式 This a book is good 怎么改错 Is this a book?的复数句改错题：This is a my book. This is a book变成一般疑问句 this is a nice book的感叹句? This is a nice book,____it?填空改错This is a expensive book This is a book.(It's,Its) this is a book on ________(electronic) This is a Engilsh book.改病句