已知函数f（x）=log₂（m+$\frac{m-1}{x-1}$）（m∈R，且m＞0）．

（1）求函数f（x）的定义域；

（2）若函数f（x）在（4，+∞）上单调递增，求m的取值范围．

阅读理解，判断正误。

Four Seasons

    Spring is the best season of the year. It lasts from March to May. The days get longer. The nights get shorter, and the weather gets warmer. Everything begins to grow. Grass and trees begin to turn green. Flowers begin to come out. Children begin to fly kites outdoors.

    Summer comes after spring.  It is the hottest season in the year. It lasts from June to August. People try to find a cool place then. They always go swimming in pools, lakes, and rivers.

    Autumn is the harvest season. It gets cool. Farmers begin to reap (收割).They are busy from September to November.

    The coldest season of the year is winter. It's from December to February. The days are short and the nights are long. It snows sometimes and that makes the children happy. They make a snowman and dance around it. They go ice-skating as well.

下列固体中属于晶体的是（　　）

发展社会主义民主政治，必须坚持中国特色社会主义政治发展道路，坚持党的领导、人们当家作主、依法治国三者有机统一，请问：坚持党的领导、人们当家作主、依法治国三者有何关系？