题目

Due to the outbreak of the novel coronavirus pneumonia (NCP), people all over the world are wearing masks to reduce the risk of infection. In fact, masks have been helping mankind for centuries. Let’s take a look at some mask-related history.1st centuryIn that century, many people in Roman Empire worked underground in mines to support their families. But most of them suffered from and even eventually died of respiratory (呼吸的) illnesses. To address this problem, Pliny the Elder (23-79 AD), recommended the use of animal bladder (膀胱) skins to stop dust from being breathed in. Although 定义在R上的偶函数,当x∈[0,+∞)时, 是增函数,则、、的大小关系是： A． > >        B． > > C． < <        D． < <