45.【解析】选[C]。此空独立成段,所以只能从段际关系来分析。因为前两段描述了史前动物由低级向高级的进化过程,而此段后就是结尾段,因此,此段必然要起承上启下的作用。所谓 承上,是指要对上文进行一定的概括、总结;所谓 启下则是要引出下文。下文中的reptile在本题空白处前面的文章中从没有提到,在下文中又没有作为新信息,因而作为正确答案的选项中一定有这个词。[C]从375 million years ago的化石的发现到300 million years ago的化石的发现,以及此后nearly 150 million years内the reptiles的存在,不但对史前动物的进化过程做了很好的概括,而且为下文the Age of Reptile的出现打下了伏笔,是一个很好的承上启下的过渡段,所以正确答案只能是[C]。
仿真试题
Passage 1
It was a cold, rainy and wholly miserable afternoon in Washington, and a hot muggy night in Miami. It was Sunday, and three games were played in the two cities. The people playing them and the people watching them tell us much about the ever-changing ethnic structure of the United States.
Professional football in the United States is almost wholly played by native-born American citizens, mostly very large and very strong, many of them black. It is a game of physical strength. Linemen routinely weigh more than 300 pounds. Players are valued for their weigh and muscles, for how fast they can run, and how hard they can hit each other. Football draws the biggest crowds, but the teams play only once a week, because they get so battered.
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