Mr. Li will go to Guangzhou by air. His workmates are ______ at the airport.
A：turning him off
B：seeing him off
C：taking him off
D：putting him off
﹣5的相反数的倒数是（ ）
下列选项中属于器官的是（ ）
远道而来的欧洲殖民者在屠杀印第安人的同时，抢占他们的家园，掠夺他们的财产。残酷的历史现象对欧洲社会产生的重大影响是（ ）
