It was the last time Susan Butcher ran the Iditarod Trail Sled Dog Race in 1992. An hour into the race, Susan and her sled dog team sped down a hill and crashed into a fallen tree. Although hurt, Susan continued the difficult race.
The Iditarod Race started in 1925 when a doctor in Nome, Alaska was desperately in need of medicine to stop the spread of a deadly disease. Only a hospital had what he needed, but it was 700 mile-away! In January, it was too dangerous to send a boat and too stormy for his tiny airplane. The only hope was to use several sled dog teams following a trail, called the Iditarod Trail. They passed the medicine from one sled team to another. Wind and snow did not stop the men and their dogs. The medicine was delivered in record time. The race follows the route of the famous medicine run. Over 1,000 miles long, it is considered the toughest race in the world.
Susan Butcher was born in Cambridge, Massachusetts. In her teens Susan was given a Siberian husky dog and became very interested in huskies as sled dogs. After reading about the Iditarod Race, Susan moved to Alaska. She got several jobs to earn money to buy herself a sled and a team of huskies. After years of hard work and training, Susan achieved her dream of racing on the Iditarod Trail.
In 1978, at the age of 24, Susan entered the race for the first time and became the first woman to finish in the top 20. In 1982 she came in second. In 1984 she was leading her team across a frozen waterway when they fell into the water. Her lead dog managed to pull Susan and the other dogs out of danger. Remarkably, she came in second.
In her fourth race, in 1985,a starving moose(驼鹿) attacked her dogs, killing two and injuring eleven. Susan had to leave the race. In 1986 Susan joined the race again. This time, she won. She won again in 1987. In 1988 she became the first person ever to win three Iditarod races in a row.  Unbelievably, Susan won for the fourth time in 1990.
According to text, Susan Butcher entered the Iditarod Trail Sled Dog Race at least     times.

A．six

B．seven

C．eight

D．nine

In Paragraph 2, the author wants to tell us          .

A．how the Iditarod Trail Sled Dog Race began

B．how the spread of a deadly disease was stopped

C．how tough the Iditarod Trail Sled Dog Race was

D．how Susan Butcher began to show interest in the race

In the year          , Susan Butcher won three races in a row.

A．1984, 1985 and 1986	B．1985, 1987 and 1988
C． 1986, 1987 and 1988	D．1987, 1988 and 1990

What led to some of Susan Butcher’s failures?

A．Snowstorm.	B．Lack of food.
C．Accidents.	D．Lack of experience.