请按要求修改下面一段话。

　　A2010年上海世界博览会世界各地吸引了7000万人次前往参观。B数百年来，对“和谐城市”模式的探讨，从来没有停止过。中国举办世博会是一次展示国力的好机会。C从“乌托邦”到“理想城市”、再到“田园都市”，人们一直在探索如何建立城市的平衡与和谐。世博会，D既是人们展示创新成果的舞台，而是人们交流城市发展模式的平台。

①A句语序不当，正确的表述是：____________________________________

②B句句子成分不完整，修改后句子应为：____________________________

③C句有一处标点错误，应改为______________________________________

④D句中的关联词搭配不当，修改后句子应为：________________________

⑤文中有一个句子与上下文衔接不当，应删去。这个句子是：____________

The UNIX operating system is made up of three parts; the kernel, the shell and the programs. The kernel of UNIX is the (71) of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to (72) .
The shell acts as an (73) between the user and the kernel. When a user logs in, the (74) program checks the username and password, and then starts another program called the shell. The shell is a command line (75) (CLI). It interprets the commands the user types in and arranges for them to be carded out. The commands are themselves programs: when they terminate, the shell gives the user another prompt (% on our systems).

A．interconnect

B．index

C．interface

D．interpreter