A．be familiar with use of certain softwareB．be familiar……

单项选择题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