doll和on发音一样吗（not和doll中的o发音一样吗）

发音一样，都含有/ɒ/音。
I bought a new doll for my daughter.

我给女儿新买了一个洋娃娃。

The rich man recruited a doll as a secretary.

这个有钱人招聘了一位有魅力的年轻女人做秘书。

This mother always dolls herself.

这位母亲总是把自己打扮得漂漂亮亮。

The child was busy playing with her doll.

孩子忙着玩她的玩偶。

The child was clutching a doll in her hand.

女孩手里紧紧抱着一个玩具娃娃。
Look at all the books on your desk!

看看你书桌上这么多书。

We were on a hill, right on the edge of town.

我们在一座小山上，正好位于城镇边缘。

What's on TV?

电视上有什么节目？

doll和on发音是不一样的。