先化简，再求值:$$$\frac{x}{x^2-1}·\left(\frac{x-1}{x}-2\right)$，其中$x\left(x+1\right)=2\left(x+1\right)$

右图为美国学者米勒模拟原始地球条件和大气成分的实验装置．此实验说明

    Yuan Longping is one of China's most famous scientists. ____(work) the land to do his research, he considers himself a farmer. Indeed, his sunburnt face and arms and his slim, strong body are just like those of millions of Chinese farmers, ____ he has struggled for the past five decades. When he was young, he saw many people dying of ____ (hungry), which was a ____(disturb) problem in many parts of the countryside. Then, he devoted all his time and energy ____searching for a way to increase rice harvests without expanding ____ area of the fields. In 1973, he became the first agricultural pioneer in the world ____ (grow) rice that has a high output. Now, he remains ____(circulate) his knowledge in many less developed countries to increase their rice harvests. He is quite ____(satisfy) with his life. However, he doesn't care about being famous. He feels it gives him less freedom to do his research. In his view, spending money on himself or ____ (lead) a comfortable life means very little to him. He therefore gives much money to equip others for their research in agriculture.

读《揠苗助长》，你能用本文中的成语填一填吗？

人们常用____来形容非常疲乏，一点力气也没有了。用____来比喻违反事物发展的客观规律，急于求成，反而把事情弄糟。当我们兴趣很浓，兴头很高时，我们可以说____。