单项选择题
Listen to the following dialogue to choose the most appropriate answer。
A.They like to talk with her. B.They have mental problems. C.They were insulted by the doctor. D.They’ve just felt on edge.
A.Seasonal differences in what mothers ate during pregnancy. B.Infection occurring at different times of the year. C.Its family background. D.Both A and B.
A.Teacher. B.Basketball player. C.Doctor. D.Engineer.