单项选择题

Questions 147-149 refer to the following magazine article. Is dentistry the career for you Today’s dentists have many more opportunities than they used to. In the past, a dentist’s life was predictable. Most were men who would leave home for a few years to study at a dental school, then return to their hometown, open up an office, and work there their whole life. Most dentists looked forward to this or something similar. Today, dentists are more mobile. Men and women can (147) dental school in different places. Some still return to their hometown to work. Others move on to new cities. Dentists today may specialize in one or more areas. Two common ones are oral surgery and dental public health. Oral surgery focuses (148) treating diseases and problems through operations. Dental public health concentrates on improving the dental health of a community. For example, these dentists (149) to schools to teach children how to brush their teeth. Some dentists work only in their specialty areas while others do both general and specialty work.