单选题 Contrary to popular belief, {{U}}assumption{{/U}} that we are not alone in the universe is as old as philosophy itself.

【正确答案】 D

【答案解析】[分析] 形近识别 assumption假定，设想；而A．consumption消费，消费量；B．prediction预言，预报； C．provision供应，供应品；D．speculation思索，构思，推测。所以答案为D。