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Children have their tongues checked up before stepping into the kindergarten in Beijing, April 10, 2009. [CFP]
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![Children have their tongues checked up before stepping into the kindergarten in Beijing, April 10, 2009. [CFP]](http://images.china.cn/attachement/jpg/site1007/20090414/000bcdb95f1d0b4e80672f.jpg "Children have their tongues checked up before stepping into the kindergarten in Beijing, April 10, 2009. [CFP]")