听力原文：Thanks for coming to our staff meeting today. It is with great pride that I annou

听力原文： Thanks for coming to our staff meeting today. It is with great pride that I announce that our mobile telephone coverage area has grown. We have tripled the area we serve, and are now able to provide service to the entire region. I know that you have all worked very hard and I want to thank you for your great efforts and the many hours you've put in so that this could happen. Already our revenue has increased by 30 percent. To celebrate our achievement, and to show you our appreciation, we will be having a company picnic in Memorial park on Saturday. Your families are welcome to join us. There will be games and lots of great food. I hope you can all come to the picnic.

What is the main purpose of the talk？

A．To announce a merger

B．To publicize a new product

C．To thank staff

D．To introduce new sales representatives