While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a discovery which led to greater understanding of cell differentiation.


a new class of mutant genes was discovered by Barbara McClintock, a discovery which led

a new class of mutant genes in corn were discovered by Barbara McClintock, leading

Barbara McClintock discovered a new class of mutant genes, and it led

Barbara McClintock discovered a new class of mutant genes, a discovery that led

Barbara McClintock, who discovered a new class of mutant genes, leading

考题讲解

题目分析:
略。

选项分析:

A选项:分词短语While studying the genetic makeup of corn是伴随状语,动词study在字面上的主语为主句主语a new class of mutant genes,这是不正确的。在逻辑上,研究玉米的基因组成的,只能是人,而不能是基因序列。

B选项:While studying the genetic makeup of corn逻辑主语错误同选项(A)。另外,句末的分词短语 leading to greater understanding of cell differentiation也是伴随状语。其字面主语也是a new class of mutant genes。类似地,在逻辑上,能“给我们带来对细胞分化的更深层次的理解”的只能是发现这件事,不能是单纯的基因序列。

C选项:代词it的指代对象只能是单数名词,不能是句子。因此,lead的主语错误同选项(B)。

D选项:Correct. 本选项在语法和逻辑上均是正确的。a discovery that led to greater understanding of cell differentiation是同位语

E选项:整个句子缺少谓语动词

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Prep2008E1-SC

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