expensive

quality

doubt

We say that successful people have "knowledge". Since it is "learning", it is necessary to "learn" and "ask". Where does the problem come from? Free from doubt. Only by doubting, being good at doubting, questioning and exploring doubts can we acquire profound knowledge and apply it to the people's cause. Chen Xianzhang, a scholar in the Qing Dynasty, believed that learning is expensive, small doubts make small progress, and big doubts make big progress; Skeptics have a chance to realize. Therefore, we say: learning is important.

People often compare knowledge to the ocean, which is boundless.

No matter how much knowledge a person has, there will always be ignorance, and being suspicious, suspicious, questioning and inquiring are the ways to acquire new knowledge. It is based on this that Balzac, a great French writer, said: "The key to all science is undoubtedly a question mark, and the wisdom of life probably lies in asking why everything happens." Indeed, if Darwin had no doubt about creationism, there would be no theory of natural selection. Therefore, only doubt can make our tree of knowledge blossom brilliantly and bear fruitful fruits.

However, we should understand that doubt is based on rich knowledge and serious thinking, and it is by no means groundless doubt or casual doubt. Darwin's suspicion of creationism is not a whim, but after he traveled around the world with the sailing ship Beagle, he observed and collected a large number of animal and plant specimens and investigated and studied countless geological data. After comprehensive discussion, he issued a strong challenge to the deep-rooted "creationism". This is the challenge of truth to falsehood, and the result is naturally the victory of truth. It can be seen that any effective doubt depends on careful analysis of facts and in-depth study of theory.

But many of our young people are not good at doubting and discovering. They believe that what is written in the book is correct and what the predecessors said is the truth. They are superstitious about books and worship their predecessors, and dare not cross the line. Such a person will naturally not find anything, let alone have any original opinions. They have made little contribution to social progress, and may even become a stumbling block to social progress and hinder the development of human civilization. If there are more such people, our society will not progress and human civilization will stagnate. So we must advocate the spirit of doubt. More than half a century ago, Mr. Lu Xun advocated this spirit through Diary of a Madman. Now, the wheel of history turns week after week, and it is time for us to take up the steel gun of reverse thinking as a weapon and March into science.

Geologist Li Siguang once said to his students, "Without doubt, you can't see the truth." This sentence also applies to us. If we want to increase our knowledge and seek truth, we must be suspicious and suspicious. This is our golden key to open the door of knowledge. Young friends, bravely pick up this key and open the door of science!

The central argument of this paper is that

The purpose of quoting Chen Xianzhang, a scholar in Qing Dynasty, at the beginning of the article is

2. Fill in an appropriate sentence on the horizontal line of the second paragraph of the article according to your own understanding and the meaning of the context.

People often compare knowledge to the ocean, which is boundless.

3. The sentence that draws a curve in the third paragraph of this article is demonstrated by the previous example.

Point of view, and come to the conclusion that

This conclusion.

4. The sentence "If Darwin didn't doubt the creationism, there would be no establishment of the theory of natural selection" proves the central argument with examples. Please use the same sentence pattern as this sentence and write an example with similar content to prove the central point (the example in this exam is not allowed).

According to this newspaper, an expert used a 2500 rpm electric drill to drill wood. After many experiments, the wood only smoked but didn't burn, so he wrote the article "Drilling wood can't burn". As a result, the content of "Suiren's drilling a fire pit" has been deleted from middle school history textbooks. Liu Yu, a student in a school, has doubts about this and has done a lot of research and experiments. Finally, it succeeded in drilling wood for fire and restored the historical position of "Suiren's drilling wood for fire". Please combine your understanding of the article "Query on Learning Expertise" and talk about your understanding of this matter (requirements: clear point of view, thorough reasoning, about 80 words).