单选题 There was a terrible ______ as the crowd waited to hear who had been killed in the accident.

【正确答案】 C
【答案解析】本题测试名词辨义。impression意为“印象”；diffusion意为“传播 ;tension意为“紧张状态”；stimulation意为“刺激”i本句大意为：人们紧张地等待，想知道究竟是谁在事故中死亡。