og50

      As a baby emerges from the darkness of the womb with a rudimentary sense of vision, it would be rated about 20/500. or legally blind if it were an adult with such vision.

(A)  As a baby emerges from the darkness of the womb with a rudimentary sense of vision, it would be rated about 20/500, or legally blind if it were an adult with such vision.

(B)  A baby emerges from the darkness of the womb with a rudimentary sense of vision that would be rated about 20/500, or legally blind as an adult

(C)  As a baby emerges from the darkness of the womb, its rudimentary sense of vision would be rated about 20/500; qualifying it to be legally blind if an adult

(D)  A baby emerges from the darkness of the womb with a rudimentary sense of vision that would be rated about 20/500; an adult with such vision would be deemed legally blind.

(E)   As a baby emerges from the darkness of the womb, its rudimentary sense of vision, which would deemed legally blind for an adult, would be rated about 20/500.

In choice A, it, the subject of the main clause, seems to refer to baby, the subject of the subordinate clause; thus, A seems to state that the newbom baby, rather than its sense of vision, would be rated 20/500. Similarly, choices B and E use awkward and ambiguous phrasing that suggests that the sense of vision, rather than an adult with 20/500 vision, would be considered legally blind. C incorrectly uses the semicolon, which should separate independent clauses, to set off a verb phrase. The phrase if an adult in C is also illogical, since it states that a baby could also be an adult. D is the best choice.

1、黄色解释是否可以总结为：主从句中的主语若都为名词，可以不一致；若主句主语为代词或从句主语为代词，则认为该代词指代的主语与从句或主句名词主语一致。否则，产生歧义。

2、a中or legally blind是形容词作伴随成分吗，其修饰规则是就近修饰名词吗，可以跳跃修饰吗，很疑惑。

请nn解释。

总结：代词指代，就近指代 or按逻辑意思指代？

MM可以参考下。

1、从黄色部分只能总结出后半段

2、a中or legally blind，不是什么修饰的问题，个人认为，它和其后的if从句一起，做为被逗号和连词or所连接的一个独立的句子，这里可能是省略了or it woul be legally blind if it were an adult with such vision.(这个补出的成分也不合适，楼主大概理解下就完了）