One of the natural wonders of the world, the Great Barrier Reef (二)

Questions:

1.What can you learn from the passage?

2. Can you describe a natural wonders you know to your partners?

        Many of the creatures are exquisitely beautiful, but some seem straight out of science fiction, while others can kill in an instant. And just when you think you know the reef, it changes every second, every hour, every day, and every year. t's a world of continual surprises.

        This is the amazing story of an everchanging natural miracle, the Great Barrier Reef.The Great Barrier Reef is so large that it can be seen from space, quite an achievement considering the size of the creatures that built it. A vast system that is the Great Barrier Reef is created by animals that are tiny. Although they might look like plants, actually they are animals called polyps. Each polyp is like a tiny upside-down jelly fish sitting in a stony cup. They live together in colonies, like underwater tower blocks.