An explosion on Thursday killed one and injured 21 in a busy street in Tongren, Southwest China’s Guizhou Province. The bomb was hidden in a rubbish bin in the city’s commercial hub（商业中心），where lots of shops and restaurants are concentrated. The ear-splitting blast was heard around 12∶50 p.m.，said a local newspaper, citing witnesses. The power of the blast shattered（使粉碎）nearby shop windows and ripped the stainless（不生锈的）steel rubbish can to pieces. One passer-by，identified（确认）only as Zhang，said she was shocked by the noise and saw a lot of pedestrians lying on the ground when she got to the scene. Thirteen of the injured were taken to a local hospital after the explosion. A doctor there said five were in serious condition but already out of danger after emergency treatment. The others were just slightly hurt. The cause of the explosion is still under investigation, said an officer with the Tongren police, but refused to speculate as to the cause. 小题1:It can be inferred from the passage that ________.
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