A cyclist wears a mask to protect against the sandstorm in Lanzhou, Northwest China's Gansu Province, March 28, 2007. Northern China was blanketed in dust on Saturday as the first sandstorm of the year struck the region, including the capital Beijing. [newsphoto]

A woman walks amid sandstorm in Lanzhou, Northwest China's Gansu Province, March 28, 2007. Northern China was blanketed in dust on Saturday as the first sandstorm of the year struck the region, including the capital Beijing. [newsphoto]

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