1. (2020·江苏) 听下面一段较长对话，回答以下小题。

Hello, Helen Smith speaking. Can I help you?<br />Hello, this is David. Could I speak to Mike, please?<br />I'm afraid he's not available at the moment. Would you leave a message?<br />Yes, I'm calling to cancel a meeting we scheduled for this afternoon.<br />Okay, let me take this down. Could I have your name again?<br />Certainly, it's David Stone.<br />Hello, Helen Smith speaking. Can I help you?<br />Hello, this is David. Could I speak to Mike, please?<br />I'm afraid he's not available at the moment. Would you leave a message?<br />Yes, I'm calling to cancel a meeting we scheduled for this afternoon.<br />Okay, let me take this down. Could I have your name again?<br />Certainly, it's David Stone.

1. （1） Why does David want to speak to Mike?

   A . To invite him to a party. B . To discuss a schedule. C . To call off a meeting.
3. （2） What do we know about the speakers?

   A . They are colleagues. B . They are close friends. C . They've never met before.