journal need to ready some paper to finish the questions

This is a “journal” but it basically just answer the questions(please read the papers I provide).

There are 20 questions in total, and they related to 4 papers. Each paper have some question to answer, and please just answer the question directly, you don’t need write them into a “journal” formal. It is not a essay. Each question should have 150-200 words. And please answer in single spaced:)

Thank you very much:)