题目内容：

Medicine

Medicine is the science of keeping people healthy, and healing the sick. Humans have practiced forms of medicine for thousands of years. Today specially trained people called doctors practice medicine.

There are many parts to a doctor’ s job. Doctors’ first need to identify what is making a person sick. Then they decide on a treatment. They also predict when the patient will feel better.1. When treating patients, doctors work with many other people, including nurses and physician assistants.

Becoming a doctor involves years of education and training. Medical students first graduate from college.2.Students usually earn a Doctor of Medicine degree in medical school. After medical school most graduates enter a residency ( 住院医师实习期)， which is a training program usually in a hospital.3.During this time, new doctors can specialize in a particular type Of medicine in such areas as internal medicine (内科学) or surgery (外科). Finally, new doctors must pass a test to get a license to practice medicine.

In the 1900s scientists developed vaccines (疫苗) to prevent many diseases and drugs to treat many others. Doctors transplanted organs from one person into another. They used many machines to help them to identify and treat diseases.4.

Today doctors have many ways to help patients heal.5. For example, scientists are still searching for cures for cancer, AIDS, and many other diseases.

A. They can be used to prevent diseases.

B. In addition, doctors try to prevent illnesses.

C. Doctors thought diseases were caused by the gods.

D. Then they spend three to four years in medical school.

E. But there are still many unanswered questions in medicine.

F. They also learned how good nutrition helped people to stay healthy.

G. During a residency, experienced doctors train the new doctors for three to seven years.