The most common explanation is that great whites dont see well. It has been thought that they mistake people for the seals or sea lions which make up a large part of their diet. There is reason to doubt this，however. Recent information shows that great whites can actually see very well. Also，when attacking seals, great whites shoot up to the surface and bite with great force. When approaching humans, however, they most often move in slowly and bite less hard. They soon discover that humans are not a high fat meal. They spit us out because were too bony, says Aidan Martin，director of Reef Quest Center for Shark Research.

　　Shark researchers like Martin hypothesize that great whites are actually curious animals that like to investigate things. Its possible that they use their bite not only to kill and eat, but also to gather information. Although such an experience is unlucky for people like Craig Rogers, when sharks bite surfboards or other objects or people，they are likely just trying to learn what they are.

　　词汇：

　　scan vt审视，细看,浏览

　　elbow n.肘，肘部

　　surface n, 表面，外表;vi.浮出水面，浮现

　　drown vi.淹死，溺死

　　注释：

　　1. ... cut two of his fingers on the sharks teeth.被鲨鱼咬掉了两个指头。

　　2. A person has a greater chance of being struck by lightning or drowning in a bath than of being killed by a shark.比起被鲨鱼杀死,人类更有可能被闪电击中或是淹死在浴缸中。

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