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  3. There is something intrinsically fascinating about the idea of evolution. What principles govern the evolution of a species? And

There is something intrinsically fascinating about the idea of evolution. What principles govern the evolution of a species? And

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问题    There is something intrinsically fascinating about the idea of evolution. What principles govern the evolution of a species? And what does evolution tell us about the place of Homosapiens in the grand order of things? The writer George Bernard Shaw held that a mystical guiding force impels life to evolve toward eventual perfection. Modern scientists may not believe in this guiding force or in the possibility of perfection, but many would agree that life has been improving itself through evolution for billions of years. (Note that this conveniently makes Homosapiens, a very recent product of evolution, one of the newest and most improved versions of life.) In the view of these scientists, constant competition among species is the engine that drives the process of evolution and people’s life upward.
   To Darwin, nature was a surface covered with thousands of sharp wedges, all packed together and jostling for the same space. Those wedges that fared best moved toward the center of the surface, improving their position by knocking other wedges away with violent blows. The standard example that textbooks give of such competitive wedging is the interaction between the brachiopods and the clams. Clams were long held to be ancient undersea competitors of brachiopods due to the fact that the two species inhabited the same ecological niche. Clams are abundant today, whereas brachiopods (dominant in ancient times) are not. Modern clams are also physiologically more complex than brachiopods are. The standard interpretation of these facts is that the clams’ physiology was an evolutionary improvement that gave them the ability to "knock away" the brachiopods.
   In recent years, however, the prominent naturalists Stephen Jay Gould and C. Brad Calloway have challenged the validity of this example as well as the model it was meant to support. Gould and Calloway found that over most geological time clams and brachiopods went their separate ways. Never did the population of brachiopods dip as that of the clams rose, or vice versa. In fact, the two populations often grew simultaneously, which belies the notion that they were fighting fiercely over the same narrow turf and resources. That there are so many more clams than brachiopods today seems rather to be a consequence of mass deaths that occurred in the Permian period. Whatever caused the mass deaths — some scientists theorize that either there were massive ecological or geological changes, or a comet crashed down from the heavens — clams were simply able to weather the storm much better than brachiopods.
   Out of these observations, Gould and Calloway drew a number of far-reaching conclusions. For instance, they suggested that direct competition between species was far less frequent than Darwin thought. Perhaps nature was really a very large surface on which there were very few wedges, and the wedges consequently did not bang incessantly against each other. Perhaps the problem facing these wedges was rather that the surface continually altered its shape, and they had to struggle independently to stay in a good position on the surface as it changed.
   So where does that leave Homosapiens if evolution is a response to sudden, unpredictable and sweeping changes in the environment rather than the result of a perpetual struggle? No longer are we the kings of the mountain who clawed our way to the top by advancing beyond other species. We are instead those who looked to the mountains when floods began to rage below and then discovered that living high up has its definite advantages, so long as our mountain doesn’t decide to turn into a volcano.
The word "comet" underlined in Paragraph 3 refers to______.
选项 A、an event that could have obscured the geological record
B、a possible cause for the decline of brachiopods
C、massive ecological or geological changes
D、the acceleration of evolutionary adaptation
答案B
解析 推断题。第3段第6句首先提出不论是什么原因造成大规模死亡，破折号之后补充说明蛤类比腕足动物更经受得住生存环境的巨变，由此可以推断答案选B。comet之前的or是连接不同可能性的连词“或”，不要误读为表示解释功能的“即，亦即”。所以不可选C。
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