错题分析： 这篇做的有点晕，还要在全篇理解一下，错题有点闷的感觉，哎 2

错题： 这篇做的有点晕，还要在全篇理解一下，错题有点闷的感觉，哎 2 错题分析: 这篇做的有点晕，还要在全篇理解一下，错题有点闷的感觉，哎。 2. The rates of extinction happening today are as great as the rates during these mass extinctions. 如今物种灭绝的机 率和以往那五次大规模物种灭绝时期的几率一样高。故选A 选项C Mass extinctions occur with regularity and it is time for another one.也是达extinction发生时间规律，但是文章中说第六次五种灭绝正在进行，没有说即将发生。所以不 选C 13.又错了插空题。 In general, it is believed that these two extinctions resulted from drastic environmental changes that followed meteorite impacts or massive volcanic eruptions. 因为是讲两次物种灭绝的原因吧。。。。。放在最后比较合适。 句子分析 1 There are several hypotheses, including warming or cooling of Earth, changes in seasonal fluctuations or ocean currents, and changing positions of the continents. there be句型 有很多理论，包括地球的冷暖，季节性波动或洋流以及大陆漂移。 2 Some of the proposed mechanisms required a very brief period duringwhich all extinctions suddenly took place; other mechanisms would be more likely to havetaken place more gradually, over an extended period, or at different times ondifferent continents. 分句1:Some of the proposed mechanisms required a very brief period duringwhich all extinctions suddenly took place; 分句2:other mechanisms would be more likely tohave taken place more gradually, over an extended period, or at different timeson different continents. 1中which引导时间 嵌入结构 1、2并列 一些被提出的灭绝过程在短暂的时间段内突然发生，另一些则在一个长期的时间内缓慢发生，在不同的时间和地点。 3 The possibility that mass extinctions may recur periodically has given rise to such hypotheses as that of a companion star with a long-period orbit deflecting other bodies from their normal orbits, making some of them fall to Earth as meteors and causing widespread devastation upon impact. 分句1:The possibility has given rise to such hypotheses 分句2:that mass extinctions may recur periodically 分句3: as that of a companion star with a long-period orbit deflectingo the bodies from their normal orbits, making some of them fall to Earth as meteors and causing widespread devastation upon impact. 2中that修饰the possibility3中that修饰前面的hypothesis 周期性出现的灭绝的可能性被这样的理论所支持，长时间偏离以前的运行轨道的伴星有可能以流行的形式落到地球上并 一起大范围的毁灭性撞击。 4 Of the various hypotheses attempting to account for the late Cretaceous(白垩纪) extinctions, the one that has attracted the most attention in recent years is the asteroid-impact hypothesis first suggested by Luis and Walter Alvarez. 分句1:Of the various hypotheses attempting to account for the late Cretaceous extinctions介短 分句2:the one is the asteroid-impact hypothesis first suggested by Luis and Walter Alvarez. 分句3:that as attracted the most attention in recent years 1、2并列，2、3套 在各种想要解释白垩纪的灭绝的理论中，由Walter Alvarez首次提出的星球撞击理论在这些年中备受关注。 5 A search of sedimentary deposits that span the boundary between the Cretaceous and Tertiary periods shows that there is a dramatic increase in the abundance of iridiumbriefly and precisely at this boundary. 分句1:A search of sedimentary deposits shows that 分句2:that span the boundary between the Cretaceous and Tertiary periods 分句3:there is a dramatic increase in the abundance of iridium briefly and precisely at this boundary. 1、2套 1、3套 翻译:对于在Cretaceousand Tertiary时期之间的沉积物的研究显示有大量的iridium在这个界限中急剧增加。