What...? 与 Which...?
1. what 与 which 都是疑问代词，都可以指人或事物，但是what仅用来询问职业。如：
What is your father? 你父亲是干什么的?
该句相当于：
What does your father do?
What is your father's job?
Which 指代的是特定范围内的某一个人。如：
---Which is Peter? 哪个是皮特?
---The boy behind Mary. 玛丽背后的那个男孩。
2. What...?是泛指，所指的事物没有范围的限制;而 Which...?是特指，所指的事物有范围的限制。如：
What color do you like best? (所有颜色)你最喜爱什么颜色?
Which color do you like best, blue, green or yellow? (有特定的范围)你最喜爱哪一种颜色?
3. what 与 which 后都可以接单、复数名词和不可数名词。如：
Which pictures are from China?哪些图片来自中国?
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