作者：英吉
In human hearing, subtle differences in how the two ears hear a given sound help the listener determine the qualities of that sound.
(A) in how the two ears hear a given sound help the listener determine
(B) in the two ears hearing a given sound help the listener in determining
(C) in how a sound is heard by the two ears helps the listener determine
(D) between how the two ears hear a given sound helps the listener in determining
(E) between how a sound is heard by the two ears help the listener in determining
原文意思：在人类的听觉中，两个耳朵听某种特定声音的细小差别帮助他们来决定声音质量。
题目分析：读完A觉得逻辑没问题，留着。
B把how去了，那就成了两个耳朵的差距了，不是两个器官的差距而是两个耳朵听声音的差距，不能去掉how，干掉。
C用helps和主语differences不一致，杀。
D也用helps。杀。
E用被动，意思是两个声音被耳朵挺见，A是两个耳朵如何听到声音，显然A读起来意思更舒服！
