Visitors take a look at the engine of a Besturn B50 plug-in hybrid car during the preview of the 14th Shanghai International Automobile Industry Exhibition in east China's Shanghai, April 20, 2011. The 14th Shanghai International Automobile Industry Exhibition will be open to the public from April 21 to 28. About 2,000 carmakers and parts providers from 20 countries are due to showcase 1,100 car models, 75 of which makes their world premieres in the auto show. [Xinhua]