普通高中课程标准实验教科书 英语选修9 Unit 3 Using Language

　　The seas around Australia contain over 160 different kinds of shark, which vary in size from just 20 centimetres to over 14 metres. However, although they look dangerous because of their wide mouths and sharp teeth, all but two or three kinds are harmless to humans.

　　Another potentially dangerous sea animal is the jellyfish. Most kinds of poisonous jellyfish can cause severe pain to anyone who touches them but the poison of the box jellyfish can actually kill a human, especially if that person has a weak heart. The tiniest amount of poison from a box jellyfish can kill in less than five minutes and it is probably the most poisonous animal in the world.

　　There is one other dangerous animal in Australia worth mentioning, and that is the crocodile. Although two types of crocodile live in Australia, only the saltwater crocodile has been known to kill humans. This crocodile moves very quickly when it sees something it considers to be food, and from time to time a crocodile has snatched someone before he or she is even aware that the crocodile is there.

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