A：酒精挥发
B：蜡烛燃烧
C：干冰升华
D：铁水铸成锅
老伴去世后，狗成了老王的亲密伙伴。可狗常在老王不经意时，在邻居老李家门口大小便。爱干净的老李为此委婉提醒，但老王却有点不开心，原本亲密的老邻居开始变得有些疏离。他们关系疏离的原因在于（ ）
Jin Mao Tower has fire and life systems that allow people to save themselves rather than waiting for others to come to their r____.
13的相反数是（ ）
My mom always _______ she's busy.
