[解析]
(1)D.细节理解题。根据第一段的In fact,the island is not famous for the seals or birds.However,the real stars are the great white sharks that leap out of the water to catch the seals they are hunting.(事实上,这个岛屿并不以海豹或鸟类而闻名。然而,真正的明星是巨大的白鲨,它们跳出水面捕捉它们正在捕猎的海豹。)可知,大白鲨捕猎的方式使海豹岛闻名。故选D。
(2)A.细节理解题。第三段列举了海豹躲避大白鲨的方法。根据第三段的When they have to swim near the water surface,they swim in a zigzag(之字形的)pattern.(当它们不得不在水面附近游泳时,它们以"之"字形游动。)可知,海豹以"之"字形模式游动是为了避免大白鲨。故选A。
(3)A.推理判断题。根据第三段But with all these tricks,they can still be cleverly beaten by the sharks.Usually,the sharks will take one seal away from its group and force it to swim on the surface,where it is easy to hunt.(但是有了这些招数,它们还是可以被鲨鱼聪明地打败。通常,鲨鱼会把一只海豹从它的群体中带走,并强迫它在水面上游泳,在那里它很容易捕食。)可知,鲨鱼成功地捕杀了海豹。故选A。
(4)C.写作意图题。通过文章第一段的In fact,the island is not famous for the seals or birds.However,the real stars are the great white sharks(事实上,这个岛屿并不以海豹或鸟类而闻名。然而,真正的明星是巨大的白鲨) 以及最后一段的This is the reason why this island attracts thousands of tourists around the world every year.(这就是为什么这个岛每年吸引着全世界成千上万的游客的原因。)可知,这篇文章主要向我们介绍了Seal Island出名的原因。故选C。