The all-new A6 TFSI Quattro is unveiled at the North American International Auto Show (NAIAS) in Detroit, the United States, Jan. 10, 2011. The 2011 NAIAS kicked off on Monday at the Cobo center in Detroit, the US auto city, with more than 40 global top-notch auto brands showcasing their latest products and technology. [Xinhua]

The Prius C concept is unveiled at the North American International Auto Show (NAIAS) in Detroit, the United States, Jan. 10, 2011. The 2011 NAIAS kicked off on Monday at the Cobo center in Detroit, the US auto city, with more than 40 global top-notch auto brands showcasing their latest products and technology. [Xinhua]