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题库 / Prep2012-SC-65
In order to conserve the energy and heat they need to spend the entire winter sitting motionless over incubating eggs, male emperor penguins huddle over the nests in groups, thereby reducing the rate at which they burn energy so that it is 25 percent lower than it would be for isolated birds.
thereby reducing the rate at which they burn energy so that it is 25 percent lower than it would be for
thereby reducing their rate of burning energy it is 25 percent lower when compared with
and they thereby reduce by 25 percent the rate they burn energy, as compared to what it would be with
which thereby reduces by 25 percent their rate of burning energy, when comparing them to
which thereby reduces the rate they burn energy so that it is 25 percent lower than
题目分析：
在(A)(B)(C)选项中，reduce的主语论元为male emperor penguins（(A)(B)中的reducing是伴随状语，(C)中的代词they指代“企鹅”）；在(D)(E)中，which后的谓语动词为单数，由于前面整个句子中没有一个单数名词，所以此处可以认为reduces具有主谓一致的错误，直接排除(D)(E)。在(A)中，male emperor penguins reduce the rate at which they burn energy和it is 25 percent lower than it would be之间是因果关系（so that）；在(B)中，两个单句之间没有连词，在(C)中，两个单句之间是比较关系。
选项分析：
A选项：Correct. 本选项在语法和逻辑上均是正确的。
B选项：伴随状语thereby reducing their rate of burning energy和it is 25 percent lower之间缺少连词连接。两者应具有因果关系。
C选项：代词they的指代对象为male emperor penguins，这是没有问题的。但是，they thereby reduce by 25 percent the rate和male emperor penguins huddle over the nests in groups被并列连词and连接。在逻辑上，前者应是后者的结果，即，两者没有并列关系。
D选项：which thereby reduces by 25 percent their rate of burning energy是非限制性定语从句，其先行词由于主谓一致的原因必须为单数名词。由于前句中没有单数名词，所以此处可以认为reduces具有主谓一致的错误。
E选项：本选项错误同(D)。
B中直接拿rate和isolated birds比较有没有问题啊, 还是说我理解错了，这个地方有省略，比较的是两个rate。这种比较老是不会看
连词／定从
C选项中的rate they burn energy 感觉也有问题?
老师 C选项中的rate they burn energy 是不是也有问题? rate后是不是应该加上at which?
C选项没有并列关系