Carmakers unveiled their new energy cars, including electric cars and hybrid cars, during a media preview day at the Frankfurt Motor Show (IAA) on Monday and Tuesday. The Frankfurt Motor Show, as the world's biggest auto show, will be opened officially by German Chancellor Angela Merkel on Sept 12, running until Sept 22.

The new Porsche 918 Spyder hybrid car is pictured during a media preview day at the Frankfurt Motor Show (IAA) September 10, 2013. [Photo / Agencies]

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