阅读理解。 Most people go to a doctor in their own town or suburb. 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. This special doctor is called the 'flying doctor'. He visits sick people by plane. When someone is 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 has to take the patients to hospital. Flying doctors take about 8,600 people to hospital each year. However, most of time the person isn't very sick, and the doctor doesn't have to visit. He can give advice on the radio from the office at the flying center. He can tell the patient to use some medicine from a special medicine chest (箱子). 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 tables from bottle 5 every four hours.' 1. Some people in the Australian outback can't get to a doctor quickly, because _____. A. There are few doctors there. B. The nearest doctor is sometimes very far away from them. C. There is always heavy traffic on the road. D. They don't want to see a doctor. 2. The doctor there usually goes to visit his patient _____. A. by sea B. by air C. on foot D. in a car 3. If the person isn't very sick, the doctor only _____. A. tells him to have a rest B. tells him what food to eat C. gives him some advice D. gives him some medicine 4. From the passage we know that _____. A. people in Australia are seldom ill B. every family in the outback has a special medicine chest C. a 'flying doctor' is a man who flies people to hospital D. these are very few hospitals in Australia