邮驿是古代国家为传递（）而建立的专设机构，一般不办理民间通信。
参考答案：官方文书
Hasn't the train ? [ ]
A. got to
B, reached
C. arrived at
D. arrived
人是牛带绦虫的哪种宿主( )
A．中间宿主B．终宿主C．转续宿主D．保虫宿主E．以上均可以
