The shark may be the most feared of all marine creatures. It is not the biggest or the fastest in the sea,but it is most dangerous because it attacks a man suddenly.There are more than two hundred and fifty types of s...The shark may be the most feared of all marine creatures. It is not the biggest or the fastest in the sea,but it is most dangerous because it attacks a man suddenly.There are more than two hundred and fifty types of sharks in the world.Most of them are展开更多
文摘The shark may be the most feared of all marine creatures. It is not the biggest or the fastest in the sea,but it is most dangerous because it attacks a man suddenly.There are more than two hundred and fifty types of sharks in the world.Most of them are
