A:What’s that? Is it a picture? B:Yes, it is an old photo of

A:What’s that? Is it a picture? B:Yes, it is an old photo of my family. 我想请问一下 picture 和photo的区别 同样时照片,为什么要这么使用呢? 把第一句改为What’s that? Is it a photo? 正确吗? 我最主要是想知道picture 和photo的区别.及用法.谢谢~~~