og 264

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

为什么用using, 不用by using。 顺便能分析一下句子结构吗

og说by using 和by attracting并列意思表达错，而且一般by using被认为有意思重复之嫌。

Scientists believe that 主谓+宾语从句

the male whistling moths of Nambung, Australia 宾语从句的主语

call female moths to them .......and attract 谓语

using acoustical signals, rather than olfactory ones应是状语修饰call

up!有同样的疑问。

其他还有两个问题：

1、og解释a和e：The use of but not does not clearly convey that most other moths use olfactory signals。为什么og说不能表达清楚，还有其他的歧义吗？是因为修饰the use of 的关系吗？

2、为什么这题里的两个rather than前都用了“逗号”，不用的话不是更流畅吗？可以不用逗号吗？

请教nn.

og说by using 和by attracting并列意思表达错——我怎么没有发现？在哪？

随便摘了个句子

97. Iguanas have been an important food source in Latin America since prehistoric times, and it is still prized as a game animal by the campcsinos, who typically cook the meat in a heavily spiced stew.
(A)it is still prized as a game animal
(B)it is still prized as game animals
(C)they are still prized as game animals
(D)they are still prized as being a game animal
(E)being still prized as a game animal
All nouns and pronouns grammatically referring back to the plural noun Iguanas must be plural. Choices A, B, D, and E all produce agreement problems by using singular forms (it, animal), leaving C the best choice. In addition, D is awkward and wordy, and E offers a participial phrase (being ...) where the beginning of an independent clause is required.

OG在它自己的解释里也用了by using这样的结构，所以我认为by using本生没有问题。本题的答案是优选的结果。Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them using acoustical signals, rather than olfactory ones, and attract their mates during the day, rather than at night. 之所以using在此处可以被使用，关键在于不会引起奇异，因为by using修饰的主语是male whistling mothes，而using修饰them，而them还是指male whistling mothes，所以指代单一。如果不是这个原因的话，我认为by using是最合适的。比如：比如：We detected him by using telescope.和We detected him using telescope.的意思完全不一样。

个人看法，希望指正。

Does anybody has new idea?

"之所以using在此处可以被使用，关键在于不会引起奇异，因为by using修饰的主语是male whistling mothes，而using修饰them，而them还是指male whistling mothes，所以指代单一。如果不是这个原因的话，我认为by using是最合适的。"

this opinion is acceptable, while others are far-fetched.

up,up

为什么but not 不能清楚表达其他moths是用olfactory，而whistling moths是用acoustical。而rather than能清楚表达此意？

but not 和rather than 如何区分使用？

不好意思，石头人斑竹的这句没看懂，请详细解释一下，谢谢。