One of the station staff saw her in difficulty and came to her _____________.
A. aid
B. hand
C. place
D. set
查看答案
He ___________ the guard some money and got into the forbidden building.
A. slipped
B. skid
C. stripped
D. stopped
My sister-in-law ____________ a healthy girl last night and the whole family were thrilled to welcome the new member.
A. lived
B. did
C. delivered
D. labored
为什么要使用IPv6协议替代IPv4?IPv4向IPv6过渡有哪些策略?