听下面一段对话，回答第1-3题。 1. Which of the following services is the most expensive? [     ] A. Basic Service. B. Standard Service. C. Digital TV Service. 2. What do we know about the services? [     ] A. The Basic Service that has 76 channels is only $ 40 per month. B. The Standard Service has over 145 channels except the Disney Channel. C. They will install a converter (转换器) box for the Digital TV Service. 3. How much should the man pay after signing up the service? [     ] A. $ 40 per month. B. $ 60 per month. C. $ 120 per month.