单项选择题

Structured programming practices （）rise to Pascal, in which constructs were introduced to make programs more readable and better （）. C provided a combination of assembly language and high-level structure to create a general-purpose language that could be used from system to （）programming. Next came object orientation, which is （）of a methodology and design philosophy than a language issue. This is （）by the addition of so-called OO extensions to current languages, such as C.

This is （）by the addition of so-called OO extensions to current languages, such as C.

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