—How many students are there in your school?        

—Er, ______ the students in our school is about l , 800.           [ ]

A. a number of              

B. number of          

C. the number of            

D. the number

国际上把建设监理单位所提供的服务归为（）服务。

A．工程咨询

B．工程管理

C．工程监督

D．工程策划