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China Daily | Updated: 2015-03-19 07:33
Beijing
Students turn in anti-smog homework
Students from No. 166 Middle School in Beijing brought their anti-smog inventions to school last week. The inventions were part of a homework assignment during the winter vacation and included air purification devices and anti-smog masks costing less than 100 yuan ($16). The inventions won high praise for their practical value.
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