(2014·安徽正阳中学第一次诊断)Chelyabinsk, Russia — A meteorite (陨石) moved quickly across the sky and exploded over central Russia on Feb. 15,2013, raining fireballs over a vast area and causing a shock wave that smashed windows, damaged buildings and injured 1,200 people.

　　People heading to work in Chelyabinsk heard what sounded like an explosion, saw a bright light and then felt the shock wave, according to a Reuters journalist in the industrial city 1,500 km east of Moscow.

　　The fireball, travelling at a speed of 30 km per second according to Russian space agency Roscosmos, had blazed (熊熊燃烧) across the horizon, leaving a long white trail that could be seen as far as 200 km away.

　　Car alarms went off, thousands of windows were broken and mobile phone networks were interrupted for a short time. The Interior Ministry said the meteorite explosion, a very rare spectacle, also released a great explosive sound.

　　“I was driving to work. It was quite dark, but it suddenly became bright as if it were day，” said Viktor Prokofiev, 36, a resident of Yekaterinburg in the Urals Mountains. “I felt like I was blinded by headlights.”

　　The meteorite, which weighed about 10 tonnes and may have been made of iron, entered Earth's atmosphere and broke apart 30 km — 50 km above ground according to Russia's Academy of Sciences.

　　“The

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