单选题 Whoever formulated the theory of the origin of the universe, it is just ______ and needs proving.
【正确答案】 B
【答案解析】[解析] 句意:不论是谁提出的有关宇宙起源的理论,该理论都只是假设,有待证实。“spontaneous”自发的,“hypothetical”假设的,“intuitive”直觉的,“empirical”实证的。