题目

阅读下面短文，用括号内所给动词的适当形式填空 (必要时可加情态动词或助动词)。 Computer are very popular these days. People are talking about and using the Internet everywhere, but how many of us__1__ (know) the history of the Internet? Many people are surprised when they find that the Internet __2___(set )up（建立）in the 1960s. At that time computers were large and expensive. Computer network(网络)__3___(not work) well. If one computer in the networks __4___(break) down, then the whole network stopped. So a new network system had to be set up. It should2006年世界杯足球赛时，球员踢球瞬间，神经冲动在神经纤维上的传导形式是 [　　] A．静息电位B．动作电位C．突触传递D．反射弧