Tom didn’t go hiking with his classmates            his illness.

A. because         B. because of                C. since

发生治安事故后，导游人员应立即将旅游者转移到安全地点，力争与在场群众、当地公安人员缉拿罪犯，追回钱物。如果有旅游者受伤，要立即组织抢救。( )