求教0g13中第7题和81题的指代

wdliangjiatun

7. The intricate structure of the compound insect eye, having hundreds of miniature eyes called ommatidia, help explain why scientists have assumed that it evolved independently of the vertebrate eye.

(A) having hundreds of miniature eyes called ommatidia, help explain why scientists have assumed that it

(B) having hundreds of miniature eyes that are called ommatidia, helps explain why scientists have assumed that they

(C) with its hundreds of miniature eyes that are called ommatidia, helps explain scientists’ assuming that they

(D) with its hundreds of miniature eyes called ommatidia, help explain scientists’ assuming that it

(E) with its hundreds of miniature eyes called ommatidia, helps explain why scientists have assumed that it
OG解释：
E Correct. The phrase with its hundreds correctly refers back to the compound insect eye. The verb helps correctly agrees with the subject structure. Finally, the pronoun it correctly refers to the singular noun the compound insect eye.

78. Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles Islands.
(A) sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
(B) sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
(C) sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
(D) sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
(E) sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
OG：
A、because sloth is the object of a preposition and not the subject of the sentence,there is no resonable antecedent for the pronoun it;
第7题中的insect eye不也是介词of的宾语吗？为什么it可以指代insect eye？求解，谢谢！

shyydx

同表示不能理解，81题它给出的关于A选项的解释前半部分不能让人信服呀

kiwifoodtown

回LZ,
个人认为78题的关于指代的解释没意义，因为本题关键点不在指代问题，而在于句子结构的合理性，A的根本错误是Fossils作为主语，会使得made it the earliest known mammal 很没道理。

所以LZ选这两题做对比来研究指代问题，不合适。