Scientists say human activity contributes to climate change, but they do not agree on the rate

______ climate change may be developing. [ ]

A. with which      

B. with that        

C. at which          

D. at that

行政部门承办的责任是______

A．监督部门是否按程序办文

B．监督部门是否传达文件精神

C．到一定的时间组织有关部门清退文件，按规定收回文件

D．将文件按类归档