已知样本：3，4，0，-2，6，1.那么样本的方差是（ ）。
7
用and或but填空
1. They play basketball_________ volleyball every day.
2. I like comedies_________ I don't like thrillers.
3. Jim wants to go to a movie_________ I want to play computer games.
4. Maria has a soccer ball_________ two basketballs.
5. I like playing with chickens_________ I don't like eating chic ken.
饴糖的主要成分是蔗糖。
