1、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
2、According to a 1996 study published in the Journal of Human Resources, Americans of Middle Eastern descent were twice as likely as was the national average to be self-employed.
(A) as was the national average to be self-employed
(B) as the average American to be self-employed
(C) as the national average that they would be self-employed
(D) to be self-employed than was the average American
(E) that they would be self-employed than was the national average
3、It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(A) may be caused by the interaction where two stars orbit each other
(B) may be caused by the interaction between two stars that each orbit the other
(C) are because of the interaction between two stars that orbit each other
(D) are caused by the interaction of two stars where each is orbiting the other
(E) are caused by the interaction of two stars orbiting each other
Correct Answers：1、A 2、B3、E