▲閱讀下文，回答第 41-45 題The arrival of the original iPhone in 2007 was a leap for cell phones. The iPhone5 that Appleintroduced in mid-September of 2012 with only small changes seemed to signal that the industryhas entered an era of short hops in technology. But big innovations in smartphones are not athing of the past. Breakthroughs in smartphones could lead to changes in how smartphones lookand function in the years ahead. One of the Apple's most fascinating efforts to redefine theiPhone is Siri, the voice-activated virtual assistant that it introduced last October with iPhone4S. The feature gave consumers the ability to find information on the Web with natural voicecommands and to perform other tasks. In 2010, Apple filed a patent application for a smallfuel-cell power supply that could give the iPhone and iPad enough power to last for weeks.
41. What is the main idea of the passage?
(A) Efforts to redefine iPhone.
(B) Smartphone breakthroughs.
(C) Filing a patent for smartphones.
(D) Power supply for smartphones.