阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。（共8分，每小题2分）
Flying Doctors
Most people go to a doctor in their own town or suburb(近郊). But people in the Australian outback can’t get to a doctor quickly. The nearest doctor is sometimes hundreds of kilometers away so they have to call him on a two-way radio. 1       . He visits sick people by plane.
When someone is very sick, the doctor has to fly to the person’s home. His plane lands on a flat piece of ground near the person’s house. Sometimes the doctor has to take the patient to hospital. 2       .
However, most of the time the person isn’t very sick, and the doctor doesn’t have to visit. 3         . He can tell the patient to use some medicine from a special medicine chest. There is one of these chests in every home in the outback. Each bottle, tube and packet in the chest has a number. The doctor often says something like this: “Take two tablets(药片) from bottle number 5 every four hours.”
4          . He had only one plane. Today there are 14 flying doctor centers, 29 planes, 14 full-time doctors and several part-time doctors, nurses and dentists.

A. He can give advice on the radio from the office at the flying doctor center B. Flying doctors treat their patients quickly C. This special doctor is called the “flying doctor” D. A man called John Flynn started the Royal Flying Doctor Service in 1927 E. Flying doctors take about 8,600 people to hospital each year