单选题：Mary's parents are worried about Mary because no one was aw

题目内容：

Mary's parents are worried about Mary because no one was aware ________ she had gone. A．of where
B．where that
C．the place
D．where of

参考答案：

答案解析：

The old couple would ________ love to know how things are g

The old couple would ________ love to know how things are going on with their g

分类：英语题型：单选题

下列属于路由器数据通道功能的是（　　）。A．系统的管理 B．路由查表 C．路由表维护 D．向输出端传送分组 E．输出分组调度

分类：英语题型：单选题

网络层的互连设备是（　　），它用于连接多个逻辑上分开的网络，在网络层将数据包进行存储转发。A．程控交换机 B．帧中继交换机 C．ATM交换机 D．路由器

分类：英语题型：单选题

________ have I heard anything like that in my life.A．Only B．Surprisingly C．Nev

分类：英语题型：单选题

光纤传输中光纤自身的损耗主要有（　　）。A．连接损耗 B．微弯损耗 C．吸收损耗 D．弯曲损耗 E．散射损耗

分类：英语题型：单选题