試題詳解

21. Just how well prepared are the nation’s service providers when it comes to managing the emergence of smart phone devices?
(A) It’s an important question because smart phones are growing more innovative by the day.
(B) Fancy technologies offer the operating system of a PDA connected to the data access capabilities of the modern 3G network.
(C) That’s good news for service providers desperately seeking to boost profit margins.
(D) Using a weighted cost of $2 per minute, each smart phone costs $100 per year. ¯