阅读下面短文，然后根据短文内容选择最佳答案。

　　In recent years, the richest people in the world have come from the computer business．Bill Gates, the founder of Microsoft, has been one of the most successful．

　　His first encounter(偶然遇见)with a computer was at Lakeside School in Seattle．At the age of fifteen, he programmed computers while his high school classmates were playing basketball．In 1973, Gates went to Harvard University where he stayed for two years．

　　He left to go into business with his friend Paul Allen．By 1976, the Gates-Allen team was already famous in computer circles．In that year, they wrote a basic program for PC．Their operating system, MS-DOS, became the operating system for personal computers all over the world．

　　Gates started his own company, and he built it in his own image．At the Microsoft company headquarters near the city of Seattle, workers can wear shorts, have long hair, drink cans of soda, from one office to the other．Microsoft has become one of the biggest companies in the world．

(1)

(2)

(3)

(4)

(5)