转换工作岗位和离岗后重新上岗人员，必须（），才允许上岗工作。
A、经过登记手续
B、经过领导同意
C、重新经过安全生产教育
参考答案：C
It is my favorite book which is about _________．
A．how did Alice find her lost parents
B．what did Alice find her lost parents
C．how Alice found her lost parents
D．what Alice found her lost parents
因特网中最基本的通讯协议是（）协议。
A、FTP
B、DHCP
C、HTTP
D、TCP/IP
