Why do some people regard Lei Feng’s spirit as being outdated?The reason is that these people ___________________ the significance of Lei Feng’s spirit.
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What forms the basis of civilized society?
According to the passage, what is Lei Feng’s spirit?It is helping others for __________ and being content with ___________________________.
What do reports of passers-by hesitating to help people in need show?The reports show that it seems hard ________________________ in modern society.
在某以太网中,数据在网络层封装的是____,数据在数据链路层解封装的是____ ?
A. IP头部;Ethernet头部
B. IP头部;Ethernet头部及尾部
C. TCP头部;Ethernet头部及尾部