参考答案

正确答案：B
解析：参见第4段第1句：We pride ourselves on being the only species that understand the concept of risk，yet we have a confounding habit of worrying about mere possibilities while ignoring probabilities，building barricade against perceived dangerous while leaving ourselves exposed to real ones．大意是：人类虽是理解风险概念的唯一物种，但我们却习惯于杞人忧天而忽视真正可能发生的危险，对想象中的危险筑起层层堡垒，而却把自己暴露在真正的危险之中。