题目内容

4.We have advertised these jobs online____the hope of getting some ideal candidates.

A) on
B) in
C) to
D) about

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5.He decided to____his career as a financial planner and to start his own project.

A) cut down
B) fill out
C) turn off
D) give up

B类IP地址的子网掩码是( )

A. 255.255.255.0
B. 255.255.255.255
C. 255.255.0.0
D. 255.0.0.0

A类地址的最高位固定为（），不参与编址。

B类地址的高两位固定为（），不参与编址。