阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。
Everyone in business has been told that success is all about attracting and retaining (留住) customers. It sounds simple and achievable. But,   41  , words of wisdom are soon forgotten. Once companies have attracted customers they often  42   the second half of the story. In the excitement of beating off the competition, negotiating prices, securing orders, and delivering the product, managers tend to become carried away. They forget what they regard as the boring side of business—   43     that the customer remains a customer.
  44   to concentrate on retaining as well as attracting customers costs business huge amounts of money annually. It has been estimated that the average company loses between 10 and 30 per cent of its customers every years. In constantly changing   45   , this is not surprising. What is surprising is the fact that few companies have any idea how many customers they have lost.
Only now are organizations beginning to wake up to those lost opportunities and calculate the   46  implications. Cutting down the number of customers a company loses can make a big  47    in its performance. Research in the US found that a five per cent decrease in the number of defecting (流失的) customers led to   48   increases of between 25 and 85 per cent.
In the US, Domino’s Pizza estimates that a regular customer is worth more than $5,000 over ten years. A customer who receives a poor quality product or service on their first visit and   49   never returns, is losing the company thousands of dollars in   50   profits (more if you consider how many people they are likely to tell about their bad experience).
The logic behind cultivating customer   51   is impossible to deny. “In practice most companies’ marketing effort is focused on getting customers, with little attention paid to 52  them”, says Adrian Payne of Cornfield University’ School of Management. “Research suggests that there is a close relationship between retaining customers and making profits.   53   customers tend to buy more, are predictable and usually cost less to service than new customers. Furthermore, they tend to be less price   54  , and may provide free word-of-mouth advertising. Retaining customers also makes it   55   for competitors to enter a market or increase their share of a market.
41. A. in particular   B. in reality    C. at least    D. first of all
42.A. emphasize    B. doubt       C. overlook   D. believe
43.A. denying     B. ensuring      C. arguing       D. proving
44.A. Moving      B. Hoping      C. Starting        D. Failing
45.A. markets      B. tastes       C. prices          D. expenses
46. A. cultural     B. social       C. financial        D. economical
47. A. promise  B. plan           C. mistake         D. difference
48. A. cost   B. opportunity      C. profit          D. budget
49. A. as a result    B. on the whole  C. in conclusion     D. on the contrary
50.A. huge    B. potential      C. extra             D. reasonable
51. A. beliefs   B. loyalty      C. habits            D. interest
52. A. altering   B. understanding   C. keeping       D. attracting
53. A. Assumed  B. Respected      C. Established    D. Unexpected
54.A. agreeable B. flexible    C. friendly      D. sensitive
55.A. unfair  B. difficult     C. essential      D. convenient
41-45BCBDA 46-50CDCAB 51-55BCCDB