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Lamborghini CEO Stephan Winkelmann unveils new Lamborghini Aventador 50th Anniversary model at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai, China Saturday, April 20, 2013. (AP Photo/Eugene Hoshiko) ( China Auto Show )

Chinese models pose with Great Wall H7 SUV after its unveiled at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai Saturday, April 20, 2013. (AP Photo) ( China Auto Show )

This photo taken on April 20, 2013 shows a model dancing next to a VW Beetle (R) on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089899 )

Toyota Motor Corp. Vice Chairman Takeshi Uchiyamada delivers a speech before unveiling the company's new cars at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai, China Saturday, April 20, 2013. (AP Photo/Eugene Hoshiko) ( China Auto Show )

This photo taken on April 20, 2013 shows a Ferrari 458 Spider on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089895 )

This photo taken on April 20, 2013 shows a model posing next to a Porsche 911 GT3 on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089683 )

A model walks past Alpha 7 car, left, and @ANT2.0 concept car shown on the screen, made by Chinese automaker Chery on display at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai Saturday, April 20, 2013. (AP Photo) ( China Auto Show )

This photo taken on April 20, 2013 shows a model posing next to a Koenigsegg sports car on display on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089677 )

This photo taken on April 20, 2013 shows a model posing next to a Subaru BRZ racing car on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089460 )

This photo taken on April 20, 2013 shows the back of a Renault concept car on their stand on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089383 )

This photo taken on April 20, 2013 shows a Porsche Panamera Hybrid electric version displayed on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089648 )

This photo taken on April 20, 2013 shows a model posing next to a Mini Cooper on media day at the Shanghai auto show. The Shanghai auto show, which opens to the public on April 21, is expected to attract more than 800,000 visitors over the course of nine days. PETER PARKS/AFP/Getty Images ( 519089296 )

Guests view a prototype car from Nissan during the opening day of the 15th Shanghai International Automobile Industry Exhibition in Shanghai April 20, 2013. China's premier auto show opened in Shanghai on Saturday, with global and local automakers showcasing new models, technologies and strategies. China is the world's biggest autos market and - while growth has slowed from its blistering pace of recent years - is a key battleground for an industry that has stuttered in the U.S. and Europe. REUTERS/Aly Song ( AUTOSHOW-CHINA/ )

A model poses with a KC concept car made by Geely on display at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai Saturday, April 20, 2013. (AP Photo) ( China Auto Show )

Mazda's new CX-5 is unveiled at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai, China, Saturday, April 20, 2013. (AP Photo/Eugene Hoshiko) ( China Auto Show )

A model poses with Great Wall H7 SUV at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai, China Saturday, April 20, 2013. China's most successful SUV producer, Great Wall Motor Co., is coming out with a model that offers the room of a luxury SUV at a mid-range price. The Chinese brand, which exports SUVs to 80 countries, unveiled the H7 and its sister sport model, the H6, on Saturday ahead of the Shanghai auto show. Great Wall is one exception to the trend of independent Chinese brands struggling against foreign competition in their home market.(AP Photo/Eugene Hoshiko) ( China Auto Show Hot Wheels-H7 SUV )

A model poses with a Beta 5 SUV made by Chinese automaker Chery on display at the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai Saturday, April 20, 2013. (AP Photo) ( China Auto Show )

Guests stroll during the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) media day in Shanghai, China Saturday, April 20, 2013. (AP Photo/Eugene Hoshiko) ( China Auto Show )