单选题 As the pressure ______ the liquid rock is forced up through channels in the resistant rock to the earth' s surface.

【正确答案】 A
【答案解析】intensify加强，强化，指程度上的改变；magnify放大，扩大，指大小上的改变；heighten提高，提升；deviates偏离，改变原计划。