建设生态文明,关系人民福祉,关乎民族未来。阅读材料,回答问题。

材料一　党的十八届三中全会明确提出,建设生态文明,必须建立系统完整的生态文明制度体系,实行最严格的源头保护制度,用制度保护生态环境。

材料二　为进一步解决经济社会发展所面临的环境制约问题,改善人民群众的生产生活环境,全国人大常委会贯彻落实党的十八届三中全会精神,将修改环境保护法列入了2014年立法工作计划。

    When we talk about paper, we think of newspapers and books. But there is some paper____(use) in many other ways. Only half of____ world's paper is used for books and newspapers. Paper , on____we usually write and draw , is very good for keeping you warm. You have perhaps seen homeless men asleep on a large number of newspapers. In Finland, it is sometimes -40°C in winter. The farmers wear paper boots in the snow. Nothing could be____ (warm).

    Each year, more and more____ (thing) are made of paper. We have had paper cups and plates for a long time. But now we hear that chairs, tables, and even beds can____(make) of paper. With paper boots and shoes, you can also wear paper hats, paper dresses, and paper raincoats____you have used paper cups once, you throw them away and buy new____(one).

    The latest use of paper seems to be paper houses. These are not small houses for children ____(play) in, but real, big houses for people to live in. You can buy a house with three rooms for about 500 dollars. You can put it up by yourself in a few hours____you can use it for about five years.

党的十八届四中全会在北京人民大会堂举行，这说明北京是全国的（　　）

材料一：冬天，父亲砍掉了一棵树的枯枝。春天到了，他惊奇地发现树技上又萌发了嫩绿的新芽。于是他对孩子说：“当时我真的以为这棵树已经死了，树叶掉得精光，一点儿活力也没有。现在才知道，它确实还活着。孩子，不要忘了这个教训，不论处于何种险境，决不要事先就得出消极的结论。耐心等待，冬天会过，春天会到来。”
材料二：两名矿工到井下进行检修，不料遇到矿井塌陷，被困在井。也没有找到出路。虽然身陷绝境，他们并没有放弃生的希望。他们坚守着一定要活下去的信念。他们说：“现在我们能做的就是等待外面的人来救我们。没有吃、没有喝，我们都不怕，怕的是我们自己没有信心活下去。”九天八夜后，他们终获救了，创造了生命的奇迹。
结合上述材料，请你说说我们应该怎样珍惜自己的生命。