Why does the professor mention that coral reefs support more than 4,000 species of fish?A. To find out what students know about tropical fish. B. To contrast two types of ocean environments.C. To imply that there may be species in the Southern Ocean that have not been discovered yet. D. To imply that there may be fossil evidence of coral reefs in the Southern Ocean.
第1个回答 2015-06-02
根据教授所说 "So, how unusual is that? To have a single family of fish dominating an entire ocean, I mean, think of, say, tropical or temperate marine environments, which have incredibly diverse fish populations. Coral reefs, for example, support over four thousand types of fish, along with sponges, crustaceans and many other organisms." 再结合全文意思可知教授这里是想对两种截然不同的环境进行对比，以此引出对notothenioids 在极端环境下还能生存的惊讶。
