已知函数f（x）= $\frac{x+3}{x+1}$ ，记f（1）+f（2）+f（4）+f（8）+f（16）=m，f（ $\frac{1}{2}$ ）+f（ $\frac{1}{2}$ ）+f（ $\frac{1}{8}$ ）+f（ $\frac{1}{16}$ ）=n，则m+n=____．

分式$\frac{x+1}{x-2}$无意义，则x的取值是（　　）

血友病是X染色体上隐性基因(h)控制的遗传病。下图中两个家系都有血友病患者，Ⅲ－2和Ⅲ－3婚后生下一个性染色体组成是XXY非血友病的儿子(Ⅳ－2)，家系中的其他成员性染色体组成均正常。以下判断正确的是（    ）

阅读文章，选择正确的答案    Bim is a puppet. He is made of wood. He has arms and legs，and hands and feet. He has black hair and green eyes. There are strings(线)on his arms and legs. There are also strings on his hands and feet.

    Children like to play with Bim. They pull his strings. They move his arms and legs，and his hands and feet. They can not move his eyes or his ears. They can not move his nose or his mouth.
    Pip is a puppet, too. But she is made of cloth. She is a glove puppet. She has arms and hands，but she doesn't have legs or feet. She doesn't have any strings.

    Children like to play with Pip, too. They can put their small hands inside Pip. They can put their fingers in her hands and make them move. Children make Bim and Pip talk to each other. They make them tell each other stories

如图所示，电源电压保持不变，开关S闭合后，灯L₁、L₂都能正常发光，甲、乙两个电表的示数之比是2：3．此时灯L₁、L₂的电阻之比是（    ）