完形填空
阅读下面短文，从短文后各题所给四个选项（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, 1, words of wisdom are soon forgotten. Once companies have attracted customers they often 2 the second half of the story. In the3 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—4 that the customer remains a customer.
5 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 percent of its 6 every years. In constantly changing 7, 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 8 those lost opportunities and calculate the 9 implications. Cutting down the number of customers a company loses can make a big 10 in its performance. Research in the US found that a five percent decrease in the number of defecting (流失的) customers led to 11 increases of between 25 and 85 percent.
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 12 never returns, is losing the company thousands of dollars in 13 profits (more if you consider how many people they are likely to tell about their bad experience).
The logic behind cultivating customer14 is impossible to deny. “In practice most companies' marketing effort is focused on getting customers, with little attention paid to 15 them”, says Adrian Payne of Cornfield University' School of Management. “Research suggests that there is a close relationship between 16 customers and making profits. 17 customers tend to buy more, are predictable and usually cost less to service than new customers. Furthermore, they tend to be less price 18, and may provide free word-of-mouth advertising. Retaining customers also makes it 19 for competitors to enter a market or increase their20 of a market.
透明的介质做成，其外形如图所示，下面说法中正确的是（ ）