1. Multiple Choice (2 points for each, 20 points in total) (1) According to the survey data of myopia of students aged 6-16 in a certain place, the age distribution of patients can be reflected by ( A. line chart B.semi logarithmic line chart C.histogram D.bar chart (2) To compare the incidence rates of a disease in a certain year in three regions A, B and C, which kind of graph should be plotted? ( ) A.bar chart B. line chart C. histogram D. pie chart (3) In medical research, which is suitable to reflect the average level of a group of serum antibody titer data according to experience ( ) A. mean B.Median C.Geometric mean D. Mode (4) To describe the average level of normally distributed data, which one should be selected ( ) A. Coefficient of variation B. Variance C.Geometric mean D.mean