题干结构：whereas lines of competition are......... the lines of...................
语义理解：在更加成熟的行业，行业竞争规则已经被清晰地制定，但在互联网行业，行业竞争规则是模糊并且不直接的，今天一起竞争的企业明天也许会成为伙伴。
做题步骤分析：①首先找划线部分they的先行词；②在代词使用原则中提及：做主语的代词优先指代主语，因此they优先指代lines of competition；③进行最后一步检验：逻辑语义。把
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lines of competition带入划线部分代替they后，逻辑语义是正确的，因此they使用正确
选项分析：
A． more established industries，more有同时修饰established和industries的歧义
B． 正确
C． Unlike前后比较应该使用同种性质的词语
D． they在优先指代more established companies，而不是在指代lines of competition，此处where引导的定语从句在两个逗号之间，视为插入，可以忽略。
E． those在优先指代more established companies，而不是在指代lines of competition，此处with引导的定语在两个逗号之间，视为插入，可以忽略。
引申：
在主句中的代词，不优先指代两个逗号之间插入语的内容

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first of all this question is a bit controversial.

before we do this question, we need to define whether the internet industry is among the more established industries. if it is, both answer (a) and (d) can do. they both mean the internet industry is less established. so if there is gonna be only one answer, the first half sentence should contridict the second half of the setence, which should be (b). it means even though the internet industry is among the more established industries, it is not like other ones. 

first of all this question is a bit controversial.

before we do this question, we need to define whether the internet industry is among the more established industries. if it is, both answer (a) and (d) can do. they both mean the internet industry is less established. so if there is gonna be only one answer, the first half sentence should contridict the second half of the setence, which should be (b). it means even though the internet industry is among the more established industries, it is not like other ones. 

companies that competed出了问题。competing companies是竞争的公司，那么companies that competed是什么意思？用来竞争的公司吗？和谁竞争？表达很模糊。

相比之下，b更好competing companies和partners是两个商业上的术语。

当前还没有题目解答过程，欢迎你点击下面的“完善解答”按钮来为这一题书写题目解答过程

first of all this question is a bit controversial.

before we do this question, we need to define whether the internet industry is among the more established industries. if it is, both answer (a) and (d) can do. they both mean the internet industry is less established. so if there is gonna be only one answer, the first half sentence should contridict the second half of the setence, which should be (b). it means even though the internet industry is among the more established industries, it is not like other ones. 

浏览一遍提干，可以明切的是行业间的竞争状态进行比较。

A肯定有误，因为They指代不明确

B暂时留下，因为对比的对象明确并且清楚。

C貌似要进行比较，其实混乱，肯定不对。

D对比的主体是行业的竞争状态，Unlike和whereas矛盾，并且They指代不明确，不对。

EThose of显得不必要并且不明确。

因此选B

first of all this question is a bit controversial.

before we do this question, we need to define whether the internet industry is among the more established industries. if it is, both answer (a) and (d) can do. they both mean the internet industry is less established. so if there is gonna be only one answer, the first half sentence should contridict the second half of the setence, which should be (b). it means even though the internet industry is among the more established industries, it is not like other ones. 

如果这题的正确答案真的是B，那么只能说pearson VUE出题越来越主观随意了。

1，A one day maybe B the next, A和B应该平行

那么，最理想的表达应该是  companies that are competitors one day may be partners the next

这是完美的平行，然而选项里没有这样的选择。那么，competing companies和companies that compete哪个更合适呢？competing作为现在分词做定语，强调动作性、动作的重复、持续性。但在明天显然已经不再compete了，那么是否还有动作性，重复性，持续性可言？

2，the的特指性和不带the时候单用plural noun的泛指性：这里没有标明lines of competition有任何特指性，而作为被比较的两个不同性质的industries, 在各自industries前面加上the是没问题的。

综上所述，此题应该选A.