【正确答案】 C

【答案解析】accelerate，“加速”；reinforce，“增援”、“加强”，如：to reinforce an army 派一支军队增援：strengthen，“加强”、“使更强大”，如：Our enemy has greatly strengthened during the truce talks．和谈期间，敌人力量已大为增强。intensify，“加剧”、“加强”，如：The scientists have intensified their search for the new gene by working harder．科学家们更加努力工作加紧搜寻这种新的基因。