单选题 Poisonous {{U}}vapors{{/U}} burst out of the factory during the accident, causing several hundred deaths.
  • A. gases
  • B. threat
  • C. fuels
  • D. bubbles
【正确答案】 A
【答案解析】[解析] vapor意思是“汽，蒸气”，和gas(气体，汽油)意思相近。threat威胁；fuel燃料；bubble水泡，气泡。