题目

下列反应既是氧化还原反应，又是吸热反应的是( ) A．铝片与稀H2SO4反应                B．Ba(OH)2·8H2O与NH4Cl反应 C．灼热的炭与CO2反应               D．甲烷在O2中的燃烧反应 答案：CSammy goes to school by underground every day. (同义句)Sammy _______the undergound ____ school every day.