1. 请听第一段对话，回答小题。

Hello, Bill. Are you free tomorrow?<br />Yes. What's up?<br />I'm going to the zoo with my sister. I hear there will be an animal show in the zoo. Would you like to join us?<br />Oh, sorry. I went there last month. Have a good time.<br />Thank you.<br />Hello, Bill. Are you free tomorrow?<br />Yes. What's up?<br />I'm going to the zoo with my sister. I hear there will be an animal show in the zoo. Would you like to join us?<br />Oh, sorry. I went there last month. Have a good time.<br />Thank you.

1. （1） Is Bill busy tomorrow? 

   A . Yes, he is. B . No, he isn't. C . We don't know.
3. （2） Why isn't Bill going to the zoo tomorrow? 

   A . Because he went there last month. B . Because he will go to play football.   C . Because he doesn't like animals.