
| A.To encourage customers to join in a special program for free. |
| B.To ask for the feedback of the customers. |
| C.To express festive greetings to the consumers. |
| D.To encourage customers to consume more on line. |
| A.$ 21.97 | B.$ 25.96 |
| C.$ 16.48 | D.$ 9.48 |
| A.direct | B.unlimited |
| C.convenient | D.cheap |
| A.They lose much in the special program. |
| B.The customers spend more in the future. |
| C.This program can offer a double-win in a long term. |
| D.Amazon.com is a very popular on-line bookstore. |