The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.  

Today, there's scarcely an aspect of our life that isn't being upended by the torrent of information available on the hundreds of millions of sites crowding the Internet, not to mention its ability to keep us in constant touch with each othey via electronic mail. "If the automobile and aerospace technology had exploded at the same pace as computer and information technology, " says Microsoft, "a new car would cost about $2 and go 600 miles on a thimbleful of gas. And you could buy a Boeing 747 for the cost of a pizza."

Rapid （） of computer and information technology.