单项选择题
TCP/IP模型中，（）协议属于网络层的协议。
A.ARPB.SNMPC.TCPD.FTP
单项选择题 She soon（）to do this regularly.
单项选择题 （）not for gravity，there would be lots of things we could not do.
单项选择题 She preferred that he（）it in the kitchen.
