Questions 9 and 10 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions.
Now listen to the news. Over the past ten years, the sharp increase in the sale of personal computers was due to
A．better computer graphics and sound. B．the enhanced version of the Pentium processor. C．the success of the world’s first microprocessor. D．successful sales of Intel chips and Microsoft software.