What is avian influenza? Read the answer

22. The main contents of this paper are: what is avian flu, what are the main sources of infection of avian flu, what are the symptoms of human suffering from avian flu, and experts suggest how to prevent avian flu.

23. This means "1On May 9, 1997, influenza A virus was isolated from a 3-year-old boy in Hong Kong. In August of the same year, it was diagnosed as the first human case caused by H5Nl avian influenza virus in the world. By the end of that year, there were 8 confirmed cases/kloc-0 in Hong Kong, including 6 deaths. "

24. The function of "general" and "main" expressions is that according to the case analysis, it is about seven days, and the symptoms are similar to those of influenza, indicating that experts are not clear about the real symptoms and manifestations of avian influenza, reflecting the novelty and complexity of the virus.

25. It is interesting and thought-provoking, because curiosity helps readers read articles.

26. The landlord did not draw a clear line. The expressions used in the first paragraph include questions and examples. It aims to emphasize and increase the reliability and authenticity of the article.

27. I agree that human production and life destroy the balance of nature and violate the original development law of things. Everything has a certain causal relationship.