A harmonious society is like a symphony orchestra-each person contributes a small sound, but

when ________ with other sounds, it becomes beautiful music.[      ]

A. combining  

B. being combined

C. combined  

D. to be combined

建设项目业主根据项目功能目标的调整提出的工程变更，包括工程和建设内容的变更、 ( )的变更、设备选型的配套方案的变更。

A．建设工期

B．工艺技术方案

C．总价合同

D．进料渠道