264. Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them by the use of acoustical signals, but not olfactory ones, and they attract their mates during the day, rather than at night.
(A) by the use of acoustical signals, but not olfactory ones, and they attract
(B) by the use of acoustical signals instead of using olfactory ones, and attracting
(C) by using acoustical signals, not using olfactory ones, and by attracting
(D) using acoustical signals, rather than olfactory ones, and attract
(E) using acoustical signals, but not olfactory ones, and attracting
In A and E, the comparison between most male moths and the male whistling moth is not clear>????????
The use of but not does not clearly convey that most other moths use olfactory signals
not,but not ,rather than 意思上有区别吗?
ETS经常用rather than,但也用过 but not和but,不是吗?? | 
