单项委托服务是旅行社为（）提供的各种单项计价的（）的服务。
参考答案：散客；可供选择
用适当的介词填空。
1. They are staying there _____ three weeks.
2. She is leaving _____ June 15th.
3. What are they doing _____ vacation?
4. Alice is going camping _____ her classmates.
5. They are buy working now. How _____ you?
(4) ( )
A．用户
B．商家
C．银行
D．经纪人
