克利斯提尼时期，富有贵族吃珍贵食物，举办奢华宴会时，要承受极大的压力，他们在公共事业上的投入要远远多于个人消费。这一现象（    ）

阅读下面短文，从方框中选出适当的词，并用其正确的形式填空，使短文意思完整。每词限用一次。

   It’s very important for everyone to protect the environment. As a student, I always try my ____  to save energy at home. I turn off ____  when I don’t need them. And I try to save water when I wash the dishes. I don’t ____  bottles or newspaper away because it’s better to recycle them.
   I think everyday activities at home can make a difference to the environment. I feel proud of ____, and I will not only keep saving energy but also advise others to do the same things as me. If everyone cares about ____  the environment, I’m sure we’ll have a better life.

如图，△ABC面积为1，第一次操作：分别延长AB，BC，CA至点A₁，B₁，C₁，使A₁B=AB，C₁B=CB，C₁A=CA，顺次连接A₁，B₁，C₁，得到△A₁B₁C₁．第二次操作：分别延长A₁B₁，B₁C₁，C₁A₁至点A₂，B₂，C₂，使A₂B₁=A₁B₁，B₂C₁=B₁C₁，C₂A₁=C₁A₁，顺次连接A₂，B₂，C₂，得到△A₂B₂C₂，…按此规律，要使得到的三角形的面积超过2014，最少经过（　　）次操作．