sunnybyy

D这种选项我认为是对background information的描述，和conclusion内的关系无关

为什么这个是背景信息呢？
这么看吧

conclusion: Removing the boxeswill reduce the number of prank calls without hampering people's ability to report a fire
why we must reduce the number of prank calls ?

because; The vast majority offalse fire alarms are prank calls made anonymously from fire alarm boxes on street corners

why we can't have false alarms

because : Responding to false alarms significantly reduces the fire department's capacity for responding

所以D是介绍描述premise成立的原因，操作的原因和conclusion没有影响关系