GWD－17

Q14:

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.

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1. 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
   
2. 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
   
3. 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
   
4. 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
   
5. Unlike more established industries, with clearly defined lines of competition, those of the Internet industry are blurred and indistinct, as competing companies

最近做GWD发现许多句子出现whereas，那位NN能总结一下whereas的用法吗，尤其在比较型的语法题中？