社会主义初级阶段是不可逾越的，这是因为（）。

A.生产力发展的不可逾越性

B.生产关系的不可逾越性

C.生产工具变革的不可逾越性

D.劳动对象变化的不可逾越性

A typical (160) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless" values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (161) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (162) results during expression evaluation stored at the discretion of the language implementation, and effecting parameter (163) and (164) operations through value copying.

（164）是（）

A.assignment

B.design

C.value

D.dispatch