观察和实验是学习科学的重要方式，下列实验中观察到的颜色正确的是（　　）

小芳同学在探究“决定导体电阻大小的因素”时，做出了如下猜想：

猜想①：在温度不变时，导体的电阻与导体的材料有关；

猜想②：在温度不变时，导体的电阻与导体的长度有关；

猜想③：在温度不变时，导体的电阻与导体的横被面积有关．

供她选择的导体如表所示：

她画出了实验电路图，并按要求正确地连接了电路．请完成下列填空（只填序号）：

（1）要验证猜想①，小芳同学应选择的两段导体是____ 和____ ；

（2）要验证猜想②，小芳同学应选择的两段导体是____ 和____ ；

（3）要验证猜想③，小芳同学应选择的两段导体是____ 　和____ ；

（4）这种物理研究方法，通常叫做____ ．

根据短文理解，从A、B、C、D四个选项中选择最佳填空。

    Hello. I'm Tom. I'm a middle school student. It's nice to meet you here. First, let me tell you 1 my family. Five people are in my 2, my mother, my father, my two sisters and I. But I have 3 brother.

    My father is a worker. My mother is 4 English teacher. My sisters are sixteen. I'm fourteen. We go to the same school. We all like 5 football games. We think they're interesting. I also have a cat. 6 name is Mimi.

    There is a big tree and some small trees  (树) around my house. The big one is a pear tree and the small ones are apple 7.  8 a photo of my room. Please have a look. When  当) you 9 my room, you can see three English dictionaries on my desk. I like 10 very much.