A、Animal attack. B、Tourist conflict. C、Ship wreck. D、Road accident. A

Norm Pethrick, a 36-year-old man in Australia’s northern city Darwin, was praised on Thursday for jumping onto a crocodile’s back to save his wife Wendy at Litchfield National Park, a popular tourist spot southwest of Darwin, a local newspaper reported. Ms. Pethrick was standing on a river bank Wednesday afternoon when the saltwater crocodile attacked her, locking its jaws on both her legs as it tried to drag her underwater. Norm Pethrick, who with his wife had been collecting water, immediately went to help her. He jumped onto the back, poked the eyes of the crocodile and finally got his wife free. Ms. Pethrick was later taken to Royal Darwin Hospital for a medical treatment. The doctors said she was suffering eight puncture wounds in her right leg, a puncture wound in her left leg and a serious cut to one of her fingers. "This could have been a fatal and tragic situation," said the general manager of Royal Darwin Hospital, Dr. Len Notaras, according to a local report. He said Ms. Pethrick was saved by her husband’s " quick and diligent actions. " Dr. Notaras also said she would remain in hospital for three to four days and have an operation to clean the wounds, which are easy to get infected because of bacteria on the teeth of the crocodile.
Questions 19 to 21 are based on the passage you have just heard.
19. What is the accident?
20. What was Ms. Pethrick doing when the accident happened?
21. How were Ms. Pethrick’s wounds?