Two kinds本题询问美国有几种医生。根据文章第一句话“There are two kinds of doctors in the US”可知有两种。

(11)There are two kinds of doctors in the US: family doctors and specialists. (12)Family doctors have an office in the same area where their patients live. (13)They know most of the patients by name and often check the health of everyone in the family. (14)The other type of doctors--specialists--know a great deal about special health problems, such as a heart disease or a broken bone. It costs a lot of money to see a doctor in the US. Besides, medicines are also expensive. (15)So, medical insurance is very important in America.