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      There are many TV programs on Chinese dishes, but few are like A Bite of China(舌尖上的中国) . The seven-part documentary (纪录片) tells us something interesting about what Chinese eat in different cultures and places.

      The different kinds of foods on TV are from sixty different places. You can see so much delicious food which can catch your eyes and stomachs. And you can also learn how to make the food. That's why the program becomes so popular.

      What's more, the program is not only about food. There are also many great stories between food and people. Liu Wen, a worker of CCTV-9, says the stories also show social changes.

      "As the program works as a window, the documentary wants to help people around the world know more about Chinese dishes and its cultures," he says.

      You can see the documentary on CCTV-1 or listen to it on CCTV-9 if you like it.

影片《2012》讲述在2012年，地球因为异常的太阳活动而面临毁灭:到处都是天崩地裂、岩浆喷发，到处都是死亡。下列关于太阳活动的说法中，正确的是（    ）

在下列四种边长均为a的正多边形中，能与边长为a的正三角形作平面镶嵌的正多边形有（　　）

①正方形； ②正五边形； ③正六边形； ④正八边形