C．the student in the back row hadn't learned chemistry before

　　D．Charlie failed in making the experiment

　　As a teenager in 1972, Bill Gates boasted that he would be a millionaire by the time he was 20.While he did not quite achieve that goal, only 15 years later he was a billionaire. And by 1992,as head of the Microsoft company, he became the richest man in America with assets (资产) of approximately US$ 6.3 billion.

　　Born in Seattle, Washington on 28, October 1956, Gates was named William Henry after his father and grandfather. From the beginning, he was an extremely energetic and intelligent (聪明的) child. He had read the entire world book encyclopedia (百科全书)by the age of nine. His favorite subjects at school were science and maths and his favorite past time was “thinking”.

　　Gates first started to play with computers at the age of 13,when one was installed (安装) at his school. At that time, computers were large, awkward (笨重) machines. Operators were required to learn complex (复杂的) computer languages before the machines could be used. Even then, a great deal of time and effort was needed to perform the simplest functions. Before long, Gates was an expert at working the school’s computer. After his graduation from secondary school, Gates was accepted by the three top universities in USA -- Princeton, Harvard and Yale. He chose Harvard and began classes there the next autumn, majoring maths. But he was still obsessed (占据，心思) with computers and spent as much time in the computer laboratories as he did in the lecture halls.

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