选词填空。

    My favourite TV programme is a reality show called Survivor(《幸存者》). It isn't on TV at the moment ____  it was on last year.

    In the show, two teams of people are taken to a(an) ____ . All of them have to sleep ____  because there aren't any houses or hotels. They usually choose ____ really useful like a tooth brush since they can only ____ one thing with them. The people also have to find food and they spend a lot of time fishing and collecting fruits from the ____ . Every week one person has to____ . At the end, there are only two people on the island and one of them is chosen ____ the winner.

    I really like Survivor because it's very ____  and the people have to do things like hunting for food. I really ____  myself when I watch it. I don't want to be on the show, however, I like 1iving in a house!

已知双曲线C₁、C₂的顶点重合，C₁的方程为$\frac{x^2}{4}$-y²=1，若C₂的一条渐近线的斜率是C₁的一条渐近线的斜率的2倍，则C₂的方程为____ 。

清朝学者赵翼写诗说：“千秋疑案陈桥驿，一著黄袍便罢兵。”该诗讲的是哪位皇帝（　　）

材料：近年北京市提出了“3+2”首都经济圈及“一轴、两核、三区”为框架的京津冀都市圈发展战略构想，并称为“京三角”。它与“长三角”“珠三角”一起，并列为中国三大经济圈。