Medical education in the United States includes educational activities involved in the education and training of medical doctors (D.O. or M.D.), from 1.________ training through to continuing education of 2. _______ specialists.A typical outline of the medical education pathway is presented as medical school, 3. ________, residency, fellowship, and board certification; however, medicine is a 4. _______ profession with many options 5. _______. For example, some doctors work in pharmaceutical (制药的) research, 6. ________[音频]medicine (within a company), public health medicine (working for the 7. ________ health of a population in an area), or join the 8. ________ forces.