It's summer in the picture.划线提问,是在summer

1.what 侧重于对“是什么”的回答,是对未知事物的提问,比如：
What is that?It's a car.
2.which 侧重于对“选择哪个”的回答,是对一定范围的回答,比如：
Which season do you like best,spring,summer or winter?
3.which 一般都会有限定的范围.what 不会有限定范围.