Structured programming practices (1) rise to Pascal, in which constructs were introduced to make programs more readable and better (2) . (3) provided a combination of assembly language and high-level structure to create a general-purpose language that could be used from system to application programming. Next came object orientation, which is (4) of a methodology and design philosophy than a language issue. This is (5) by the addition of so-called OO extensions to current languages, such as application.
（2）（）
A.structure
B.structured
C.constructs
D.structures