In Internet， (66) used as a barrier to prevent the spread of viruses．(66)

A．modom

B．firewire

C．firewall

D．netcard

[单选题]The Internet is a(66)network of networks which interconnects(67)ranging from the simplest personal computers to the most sophisticated mainframes and supercomputers. This network of networks is used for an extraordinary range of purposes - long dista

[名词解释] 遮栏（barrier）

[名词解释] 堡礁（barrier reef）

[名词解释] 透过屏障（permeability barrier）

[名词解释] Blood-Thymus barrier

[名词解释] Blood-air barrier

[名词解释] 血-睾屏障（blood-testis barrier）

[单选题]Which of the following is least likely to be considered a barrier to develo

[单选题]请在（9）处填上最佳答案。A． lineB． barrierC． similarityD． conflict

[单选题]Donald Trump has signed an executiveorder ___________ a \"large physical ba