各位大大,why???

morris

Someday computers may be able to "see" forms, just as they now can be made to recognize voices, a problem of perception that is similar to artificial vision, but the solution has roved easier.
(A)that is similar to artificial vision, but the solution has roved easier
(B)that is similar to artificial vision but one that has proved easier to solve
(C)similar to that of arificial vision but it has proved easier to solve
(D)similar to that of arificial vision, but the solution has proved easier
(E)similar to that of arificial vision but one that has proved easier to solve

answer is (E).
My question is what different is when we use it (C) and one (E).
My friend told me that it can replace "a probem of perception" or "that of artificial", so it would make ambiguous. However, why we can use "one" to replace only "a problem of perception" not "that of artificial vision"??
By the way, why when i type chinese traditional words but they can't be showed in the website ,and how can i solve this problem??

sbbi

C) similar to it has proved easier to solve
"similar to" cannnot be followed by a sentence. So C is wrong..

hedgeforfun

这道题好难哦,谁能详细分析一下?

morris

SOS!!!

whitecloud57179

sbbi 已经解释得很明白啦, E 是一个形容词短语,修饰a problem of perception,里面怎么能包含句子呢?
morris可以用简体输入,微软上有下载的

travellogue

The question centres on paralell.     a problem of ..... that ......but one that....