skies to blue last Wednesday. Cars drove with lights on. School child walked with their shirts, coats and anything else they could find pull up over their nose. Some women wore scarves (头巾)
over their heads as the storm become stronger. ''Sand can be sweeping into the air when there is a drought (旱灾). Too much trees have been cut
this years, making the sandstorm problem worse. So something must be done to keep the air nice or clean.'' said the scientists.
