网络公司的客户需要为经常出差的员工提供 VPN 连接。为支持 VPN 服务器，必须将客户的路由器升级到带有高级 IP 服务功能集的新版本 Cisco IOS 软件。现场工程师在将新 IOS 复制到路由器之前应该进行什么操作（）
A. 设置路由器，使其在下次启动时支持从 TFTP 服务器加载新的 IOS 映像文件
B. 使用 erase flash: 命令删除当前安装的 IOS，然后重新加载路由器
C. 发出 show running-config 命令，查看当前安装的 IOS 映像文件的功能
D. 发出 show version 和 show flash 命令以确保路由器具有足够的存储器和文件空间容纳新的 IOS 映像
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（ill at ease）Marcus says that he always feels ill at ease when he’s（）
A. listening to the radio
B. playing with his cats
C. on a first date with a girl
D. listening to music
（fresh as a daisy）My grandma said, “I might be ninety years old, but I still feel as fresh as a daisy.” She（）
A. looks much older
B. feels much younger
C. sounds much wiser
D. feels much older
（a new lease of life）After winning her battle with cancer, Misha had a new lease of life. She was going to（）
A. change the way she made a living
B. worry about her changing life
C. live her life to the full
D. change her life
（a pain in the neck）Mark’s being a pain in the neck this morning, so（）
A. I’ll try to avoid him
B. I’ll help him with his work
C. I’ll give him a massage
D. I’ll help him
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