（）是实现导游与游客之间正常交往的必要手段，也是做好导游服务工作的前提。
A.交谈
B.微笑
C.真诚而有效的沟通
D.搞活动
参考答案：C
In the near future, more advances in the robot technology by scientists . [ ]
A. are making
B. are made
C. will make
D. will be made
参归散功效与作用
