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The epidemic has wiped out 20 years of math and reading progress of American students? Is there any scientific basis for this statement?
There is no scientific basis, this is just an excuse to throw the pot. Specifically, let's talk about the following points:

First, the epidemic in the United States has not received so much attention. The epidemic has been globalized, and the global epidemic has accumulated over 600 million, accounting for 10% of the world's total population. At the beginning, the United States was the most serious place, and they were the first to let go. Although it was preventing and controlling the epidemic at the beginning, it was gradually ignored in the end. What can such an epidemic prevention attitude throw at the epidemic?

At the beginning of 2020, we will also pay attention to the international epidemic. However, after the United States took the lead in breaking 1 0 million, the data increased sharply, reaching 90 million in the back, close to10 million. Such data is already one-third of the population of the United States. If such an attitude of prevention and control is to throw the pot on the epidemic, it can only be that those good students have died of illness.

Second, now is the computer age, all the data are backed up countless times, and scientific development is not directly related to the epidemic. Let's talk about math and reading. In the internet age, even teaching materials and research can be done by computers, and there are also various regular meetings for students and professors to do research. The transmission and absorption of this knowledge is uninterrupted. If this is a forced dumping on the epidemic, I can only say that the person in charge will really make up an excuse.

Third, the epidemic has affected the economy, but it has definitely not affected academics. The epidemic has an impact on the national economy, and some academic conferences do run aground, but these academic conferences are held every four years or so. No matter how they are affected, the epidemic will only last for three years. The epidemic in these three years has eaten up the pot that has been developed for 20 years. That's not what happened.

No matter which industry, more or less will throw the pot to the epidemic, but the real impact is that the epidemic directly affects not many services, but the most important impact is energy and the international situation. As far as an academic field is concerned, these people themselves are immersed in academics, and the closure of the epidemic has not had much impact on them.