Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete one day may be partners the next.

A.      Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete

B.       Although the lines of competition are clearly defined in industries that are more established, they are blurred and indistinct in the Internet industry, as competing companies

C.      The lines of competition are clearly defined in the more established industries, unlike the Internet where they are blurred and indistinct, as companies that compete

D.      Unlike more established industries, where the lines of competition are clearly defined, they are burred and indistinct in the Internet industry, as companies that compete

E.       Unlike more established industries, with clearly defined lines of competition, those of the Internet industry are blurred and indistinct, as competing companies

谢谢

B的问题 只说大的

industries that are more established，应该用the more established industries来替换，这里用分词做定语比用限定定语从句要准确。

as competing companies one day may be ...这里的one day作为状语修饰may be 意思是： 就好像 （一直在竞争）的公司 之后有一天可能成为合作伙伴

而as companies that compete oneday may be ...这里的oneday作为状语修饰compete 意思是：就好像某一天还在竞争的公司　之后可能变成或做伙伴。

后面那个分句里 A比B准确

哦,我好象明白了

还有一点我想问一下,是不是although连接的前后两个句子比较强调主句,而whereas连接

的句子是平行关系的?