第18题: [单项选择]The writer seems to suggest that if you don't know much about first aid, you should ______. A. call for help from professionals B. still try to help C. stand by and not try to help D. learn it from a doctor 参考答案:B 答案解析:推理题。答案在第三段。旁观者或者亲属不知道应该怎么做或因害怕而不去抢救会导致不必要的死亡或更严重的伤害。故选B。