单项选择题A.He decided not to cancel her appointment.B.His new glasses aren’t comfortable.C.He’s too busy to get a checkup.D.He has to check when the appointment is.
单项选择题A.To emphasize the dangers of the old method.B.To explain a step in the new technique.C.To show that the treatment will not cause fire.D.To illustrate a combination of old and new treatment.