B．difficult

　　C．essential

　　D．convenient

　　【解析】　此处在叙述留住顾客的好处所在，即也可以让竞争者很难(difficult)进入市场或者增加市场份额。unfair不公平的；essential基本的，重要的；convenient方便的。

　　【答案】　B

　　Ⅱ.语法填空

　　Sometimes Chinese English teachers are puzzled by 1.________questions，“Have you got any skills in reading comprehension？” Actually，many of the teachers can't give students 2.________efficient way to deal with reading.Anyway，3.________ often simply say，“Read more and practise more，and you 4.________ (get) more experience in reading comprehension.” Frankly，these teachers' good 5.________(suggest) are only helpful to arouse students' interest in reading 6.________ not helpful to deal with the questions in the examinations of reading comprehension.Personally，I think the skill for reading comprehension should be based 7.________ the knowledge of English writing.Since the English passages are written under some rules or principles，the science of reading and understanding may have a close relationship with writing.Reading comprehension can't be independent from the knowledge of writing.So 8.________(do) better in reading comprehension，we should learn the knowledge of writing，study 9.________questions are designed and the relationship 10.________ questions and the reading materials.

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