two questions, anyone there?

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.

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

the key is B, but what's wrong with A?

Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.

E, the growth of the global economy between 1990 and 2000 exceeded what it did for the 10,000 years from the beginning of agriculture.

the key is A, but i choose E, any idea?

第一题的错误应该在as companies that compete 这句话语义不通。另外B的表达前后两句话平行对称。

第二题是A，E中的错误在于it did，指代错误，A中的it 指代economy,did指代grew。

1. A: More can both modify established and Industries, right?

2. is there a logic error in E? whether the 10,000 years from the beginning of agriculture including the year from 1990 and 2000 ?

错在ｉｔ　 , 你说ｉｔ指谁？　翻译出来试试。　

这两题没见过哦～哪的阿？？