Q: Which type of    is best for comparing things? 

A: The bar graph (гистограмма) because the things compared are presented next to each other. 

Q: Why do you think the third chart is called a pie chart (круговая диаграмма)? 

A: Because it looks like (выглядит как) a pie (пирог). 

Q: What can you   in these graphs? 

A: We can read about changes over time(об изменениях с течением времени), comparisons and preferences (о системе сравнения и предпочтений).