【正确答案】 A

【答案解析】[解析] frighten：使害怕，例如：The little boy was frighten by the loud thunderstorm．大声打雷使小男孩感到非常害怕。kill：杀害，例如：Six people were killed during the explosion．爆炸使6人丧生。endanger：使…处于危险，例如：Many species of animals are now in danger．许多种类的动物现在处于危险中。rescue：救援，例如：Finally， they were rescued by the police．他们最后得到警察的救援。