GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - SN5Z7DZAFN7Y8PD3J

The passage is concerned primarily with A. pointing out that a particular type of species extinction is rarely known to occur. B. proposing a possible explanation for conflicting data about a particular type of species extinction. C. resolving a debate about the frequency of a particular type of species extinction. D. comparing two theories regarding possible causes of a particular type of species extinction. E. refuting a proposed explanation for the increasingly rare occurrence of a particular type of species extinction.