An architectural style defines as a family of such systems in terms of a (1) of structural organization. More specifically, an architectural style defines a vocabulary of (2) and connector types, and a set of (3) on how they can be combined. For many styles there may also exist one or more (4) that specify how to determine a system's overall properties from the properties of its parts. Many of architectural styles have been developed over the years. The best-known examples of (5) architectures are programs written in the Unix shell.

空白（4）处应选择（）

A.semantic models

B.weak entities

C.data schemas

D.business models

患儿，6岁，高热2d，腮腺肿大2d。诊断为流行性腮腺炎。其血清特异性抗体增高的是

A．SIgA
B．抗核抗体
C．IgE
D．IgG
E．IgM