单项选择题

The Silicon Valley of America is about seventy kilometers southeast of San Francisco. It is small in size. You will not find the 1 Silicon Valley on any maps of California. But it is a very 2 place. There are thousands of high-technology companies in Silicon Valley today.
The 3 begins with Stanford University. 4 the Second World War, Stanford University was having financial problems. It also 5 several thousand hectares (公顷) that was not being 6 . A professor at Stanford did his best to 7 the problem. He learned that the university could not legally sell the land 8 the Stanford family gave it to the university for free. However, the professor discovered there was 9 to prevent the university from 10 companies to pay the university to use the land. This idea 11 the development of an area called Stanford Industrial Park. This business area was 12 in 1954. Several leading companies moved their offices there. These 48 businesses influenced other companies to move into or near the Stanford Industrial Park.
13 the beginning of the computer age, the Silicon Valley is very famous in the world. In the early 1970s, a(an) 14 named the area Silicon Valley in a series of stories for a publication called Electronic News. Young computer engineers with little 15 started companies in this area. Many of these companies are now large international businesses. One 16 is Apple Computers.
The Silicon Valley is a name that has become so popular today that it is often used to 17 any area that is home to many electronics companies, such as Zhongguancun in China. 18 the first and most important Silicon Valley can still be 19 in California, America.