In the mid-1970's, since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced automobile emissions.


since birds were overcome by pollution, and routinely falling from the sky above Los Angeles free ways, this prompted officials in California to devise a plan that reduced

since birds that had been overcome by pollution were routinely falling from the sky above Los Angeles freeways, it prompted officials in California to devise a plan that would reduce

birds had been overcome by pollution and routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan that reduced

birds overcome by pollution routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan to reduce

birds overcome by pollution and routinely falling from the sky above Los Angeles freeways were prompting officials in California to devise a plan to reduce

考题讲解

题目分析:
本题在很多个动词上都考查了外延和内涵这一个重要的考点。咱们现在用选项分析一个一个地检查。

选项分析:

A选项:本选项有三处错误。
第一,没有主句,我们可以发现,在选项中间有一个连词and, 那么在它身前有一个句子,谓语动词为overcome,其身前有一个连词since,在and身后的句子中,falling可以作为伴随状语谓语动词为prompt, 这会使得两个谓语动词被两个连词所连接,让本选项没有了主句;
第二,划线部分最后出现了a plan that reduced automobile emissions。我们应该将定语从句that reduced automobile emissions改为不定式短语to reduce automobile emissions,这点考查了不定式和从句的区别。用之于本题,由于减少机动车的排放是一个计划的目的,即,reduce automobile emissions这个行为是主观性的,能被控制而发生的,应该用不定式短语。
另外,本题中“促使(prompt)”的主语用了this,它可以单独做一个代词。但在逻辑上,由于发出prompt的应该是复数名词birds,至少应改为these。

B选项:本选项有三处错误:
第一,fall的时态有误,应该用过去时而不是过去进行时。
第二,“计划”身后应该用不定式短语来做定语而不是用定语从句,该错误同(A)。
第三,代词it的指代对象有误同选项(A)。

C选项:首先,本选项中birds had been overcome by pollution和routinely fell from the sky above Los Angeles freeways是并列句的关系。但在逻辑上,这两句显然无法并列,应该让overcome句做鸟的定语。plan身后应该用不定式短语做定语,该错误同(A)。

D选项:Correct. 本选项在语法和逻辑上均是正确的。其中现在分词短语prompting officials in California to devise a plan是伴随状语

E选项:overcome by pollution是过去分词短语,routinely falling from the sky above Los Angeles freeways是现在分词短语,两者在语法上可以由and连接表示平行。但是,在逻辑上,这两句并没有并列关系,该错误同(C);prompt不应用过去进行时。

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