决策
参考答案：
包括规范性决策、重大决策和瞬时决策。人们的旅游决策一般分布在规范性决策和重大决策之间。
对HBV感染已获保护性免疫的指标是（）
A.抗-HBe
B.抗-HBs
C.HBeAg
D.HBsAg
E.抗-HBc
根据句意及首字母提示完成句子。
1. Eating too much c_______ is bad for our teeth.
2. Don't c________ gum in class. It's impolite.
3. He was interested in studying spiders, bees and other i ________when he was young.
4. He likes p ________ pictures with his brushes when he is free.
5. Jim's home is near his school, so he usually w ________to school.
