【正确答案】 D

【答案解析】[听力原文] To most of us, sharks are the most dangerous fish in the sea and they attack humans. However, according to Doctor Clark, who has studied the behavior of sharks for twelve years, humans are not normally on a shark's menu. What do sharks feed on? Mainly fish and other small sea animals. {{U}}Doctor Clark also found that sharks don't eat as much food as people think.{{/U}} For instance, a nine-foot shark only needs two pounds of food a day to keep healthy. But she says sometimes sharks starve and at other times they fill themselves with what they have killed. {{U}}Around the world,, there are only about 100 shark attacks on humans each year, ten of which prove fatal. But consider this: in the U.S. alone, about 3 million people arc bitten by dogs each year. Of these, 13 people die.{{/U}} "If a shark bites you," says Doctor Clark, "the reason is usually because it mistakes you for its natural food." For example, say you went underwater fishing mad saw a shark, you could be in trouble. The shark might go for the injured fish you had attacked and take a big bite of you at. the same time. {{U}}If you go into a shark's territory and threaten it, t might try to bite you.{{/U}} That's because sharks are territorial and tend to guard their territory. Like dogs, they protect the area that they think is their own. What does the passage say about the eating behavior of sharks?