下列句子中加点的成语运用恰当的一项是（   ）

A．在公园路幼儿园“六一”晚会上，小朋友们神气活现的表演，使观看的大人们非常高兴。

B．刘家两兄弟自三十年前失散后，各无音信，今天在杭州破镜重圆，两人激动不已。

C．我狙击部队经过三天三夜的浴血奋战后，伤亡十分惨重，而敌人的攻势却更加猛烈，眼看阵地就要失陷，就在这间不容发的时候，增援部队终于赶到了。

D．他的发言，头绪纷繁，逻辑混乱，听来听去，始终叫人不可理喻。

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．framework
B．deliverables
C．representation
D．semantic models