单项选择题A.An investigation into how Americans spend their vacations.B.An opinion poll of how people should spend their leisure time.C.A poll of how employed Americans spend their leisure time.D.A report on the vacation plans of college graduates in America.
单项选择题A.They help to cure anxiety.B.They help patients to gain insight into the cause of anxiety.C.They help to control anxiety.D.They help patients to work efficiently.