【听力原文】
Hundreds of emergency workers combed the site of a five-story apartment building in southern Ukraine Thursday after a series of explosions reduced it to rubble, authorities said. The blasts Wednesday night in the Black Sea resort town of Yevpatoria left at least 17 people dead and 24 others missing, according to Igor Krol, a spokesman for the Ukraine's Emergency Situations Ministry. [ 1 ] 21 people have been rescued. "We are now investigating all possible reasons for the explosions." Krol said. [ 2 ] Volodymiyr Shandra, the Ukrainian Emergency Situations minister, told local media that oxygen canisters being stored in the basement of the building could have triggered the blasts. Television footage showed rescuers trying to free people buried underneath fallen debris, while others scrabbled through wires, construction rods and boulders.
How many people were rescued from the blasts?
【做题提示】四个选项均为数字，因此在听的过程中应该特别留意数字方面的内容。
【解析】新闻中提到21 people have been rescued．可知有21人获救，故本题应选C。应注意的是要与之前的死亡人数、失踪人数相区分。