在下面①②③处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密，每处不超过30 个字。

 中华民族五千年的文明史，   ①   。东汉末年，曹操慷慨赋诗“老骥伏枥，志在千里。烈士暮年，壮心不已”，淋漓抒写了诗人  ②   。一千三百年前，李白曾吟咏“大鹏一日同风起，扶摇直上九万里”，表达了他  ③   。“忧劳可以兴国，逸豫可以亡身，自然之理也”。在《新五代史· 伶官传序》中，欧阳修总结了后唐庄宗既得天下又失天下的原因，感喟小自一人、大至一国，无不以安逸而衰亡，以理想而勃兴。

如图1是学生小张用两片长方形的木板〔3、5〕、两条松紧带〔2、4〕和一颗螺丝〔1〕制作的肌肉牵拉骨运动的模型，如图2两图表示鸟类的两种不同行为，请据图回答下列问题：

    I' m David, a baby penguin (企鹅). It is snowing outside. I am staying____my nest (~) and waiting for my parents. They went out yesterday to ____food for me. I feel so cold and hungry now because we don't have any food at all. In the last few years,____developed the economy (发展经济), but they forgot the____

    They cut many trees down and ____ lots of factories. The____ from those factories soon changed the climate (改变气候). So it's harder for my parents to find food. What's worse,____ penguins died because of the climate change. But now, people in the world seem to know their mistakes (错误) and begin to do something to save the world. I think we can live a better life in the____