阅读下列材料，从每题所给的选项中选出最佳选项。体裁：说明文　话题：海洋生物　词数：365　时间：7′

　　There are many dangerous sea creatures in the world.The following are some examples.

　　The needlefish are commonly seen living near the surface of tropical (热带的) waters.But they can also break__cover the water，and once in the air they can become dangerous flying swords.Though it is rare，people have been seriously hurt and even killed when stabbed by the fish's sharp and long jaws (下巴)．Night fishermen in small boats are at particular risk because their lights may attract the fish.

　　Saltwater crocodiles are the world's largest crocodiles，sometimes reaching 23 feet in length and topping 2，200 pounds.Yet these crocodiles hunt quietly，lying in wait below shoreline waters to attack crabs，turtles and thirsty animals that have come to drink.Saltwater crocodiles kill a number of people each year.

　　There is no doubt that the great white shark sits atop the ocean food chain.The world's largest fish can weigh at over 5，000 pounds and reach lengths of more than 20 feet.Great white sharks have about 3，000 teeth，which they typically sink into sea lions，seals，small toothed whales，and sea turtles.These sharks are responsible for a third to a half of the 100 shark attacks on humans every year.

　　The sea anemone

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