如图，在半圆的直径上作4个正三角形，如这半圆周长为C₁，这4个正三角形的周长和为C₂，则C₁和C₂的大小关系是（　　）

____的特性：有绝缘性、柔韧性、防水、可燃烧、耐腐蚀、能浮在水上、比较轻、不分解、不易传热、可重复利用。

读下图，完成下列各题。

    On Thursday evening, Jack goes to bed early. Then he sees a rabbit. Jack doesn't know1it is from. He doesn't have a pet rabbit at home.     “Come on,” says the rabbit. “Let's go to town!” “You can2?” Jack asks. “Yes,” the rabbit answers. “Come 3me.” Then the rabbit goes out of the4Jack goes with it.

    They get to a zoo. In the zoo, a(n)5 is playing the guitar under a tree. “Let's dance!” says the rabbit. Jack 6with the rabbit. And he sees the moon is dancing, too. Jack wants to tell the rabbit about this,7he can't find it. And he doesn't see the zoo or the lion. He sees his8! “Jack, get up! You have to go to school!” says his mom. Jack smiles and he can't wait to9his mom about the dream. It's so10.

“人们生来而且始终是自由的，在权利上是平等的；这些权利就是自由、财产、安全和反抗压迫；财产是神圣不可侵犯的权利；法律面前人人平等……”此话出自的文献是（   ）