About the job of bookkeeping, all of the following information is clear except ______.

单项选择题How many significant demographic changes ever occurred in the past one million years

单项选择题What does the word domestic mean in Para. 2

单项选择题What is found to have close relationship with rapid increase in population

单项选择题In fresco painting to what is the paint applied

单项选择题What is the concept most people have on population growth