A management domain typically contains a large amount of management information. Each individual item of  (1) information is an instance of a managed object type. The definition of a related set ofmanaged (2) types is contained in a Management Information Base (MIB) module. Many such MIB modules are defineD. For each managed object type it describes, a MIB  (3) defines not only the semantics and syntax of that managed object type, but also the method of idenfying an individual instance so that multiple (4) of the same managed object type can be distinguisheD. Typically, there are many instances of each managed object (5) within a management domain.

空白（3）处应选择（）

A.connection

B.window

C.module

D.destination

引起动物实验室型肾综合征出血热爆发的病毒宿主主要是（）。
在肾综合征出血热病毒流行中，最主要的病毒宿主是（）。
汉坦病毒Ⅱ型的主要宿主是（）。

A.黑线姬鼠

B.褐家鼠

C.棕背鼠

D.草原田鼠

E.大白鼠