答案　D

　　15. A. unfair

　　B. difficult

　　C. essential

　　D. convenient

　　解析　此处的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

　　Cloze 1

　　(2011·南昌第一次模拟)When I come across a good article in reading newspapers, I often want to cut and keep it. But just as I am about to do so, I find the article on the__1__side is as much interesting. It may be a discussion of the way to__2__in good health, or__3__about how to behave and conduct oneself in society. If I cut the front article, the opposite one is likely to__4__damage, leaving out half of it or keeping the text__5__the title. Therefore, the scissors would__6__before they start，__7__halfway done when I find out the__8__result.

　　Sometimes two things are to be done at the same time, both worth your__9__. You can only take up one of them, the other has to wait or be__10__up.

　　But you know the future is unpredictable－the changed situation may not allow you to do what is left__11__. Thus you are__12__in a difficult position and feel sad. How__13__that nice chances and brilliant ideas should gather around all at once? It may happen that your life__14__greatly on your preference of one choice to the other.

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