在探究“压力的作用效果与哪些因素有关”的实验中，可以通过观察海绵的形变程度来判断压力的作用效果是否明显．以下实验探究中，用到的研究方法与上述实验相同的是（　　）

看图读一读，判断句子正误。

    Hi, I'm Sally. On my way to school, I can see some trees, they're green and brown. I can see some clouds(云). They're white. I can see a bike. It's under the tree. It's blueand black. I can see a yellow cat, it's in the tree. I can hear a plane. I canhear a dog. I can hear a car and a bus, too.