我觉得TN是对的。Q4: Thepassage is primarily concerned with A. evaluating the evidence of a major geologic period and determining its duration B. describing an evolutionary phenomenon and speculating about its cause -》文章并不是说进化的现象（如三叶虫变成鱼）。 C. explaining the mechanisms through which marine life-forms evolved during a particular period D. analyzing the impact on later life-forms of an important evolutionary development E. contrasting a period of evolutionary change with other such periods
Q5. Which of the following can be inferred from the passage regarding the geologic
changes that occurred during Ordovician period?
A. They were more drastic than those associated with other radiations B. They may have created conditions favorable to the evolution of many new life-forms 文中只说产生了大量的物质，并没有表态就一定是favorable的，最后更是说这个环境变化和物种爆发的关系还不好说呢：these kinds of environmental changes may have resulted in an enriched pattern of habitats and nutrients, which in turn gave rise to the Ordovician radiation. However, the actual relationship between these environmental factors and the diversification of life forms is not yet fully understood C. They may have caused the extinction of many of the marine species living in shallow
waters D. They may have been a factor in the development of new species adapted to living both
on land and in water E. They hastened the formation of the extensive dry regions found in the western united states -》文章第一句话说那些山形成在那个时候，所以E可以作为合理的infer结果。
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