很多同学都很关注雅思阅读机经真题解析-Coral reefs这个问题，那么接下来就跟着中国教育在线小编一起来看看吧，相信你通过以下的文章内容就会有更深入的了解。 Coral reefs are underwater structures made from calcium carbonate secreted by corals. Coral reefs are colonies of tiny ...