发票基本联次为几联，特殊情况下可以增设为几联？
参考答案：
发票基本联次为三联，第一联为存根联，第二联为发票联，第三联为记账联；如有需要可增设为六联。
用所给词的适当形式完成句子。
1. I think camping can make us happier than _____ (ski).
2. Betty is _____ (thin) than me, I think.
3. Lisa is a top student. She always answers the questions _____ (correct).
4. Peter drew _____ (bad) in the drawing competition.
5. The funny film made us very _____ (excite).
6. Do you know the _____ (high) of a giraffe?
7. Beijing is one of _____ (large) cities in the world.
8. She is one of the best _____ (sing) in China.
9. He is from Britain. He is a _____ (Britain) boy.
10. After having Home Economics, I know how to cook healthy and _____ (taste) meals.
实现出版物销售的核心内容是（）。
