单选题 The idea of traveling forward into the future or back into the past has always fascinated science fiction writers. The " grandfather______" is the argument many people use to suggest that time travel is impossible.
【正确答案】 A
【答案解析】解析：句意：科幻小说作家们常着迷于穿梭于过去和未来的想法中，而许多人却会用“祖父悖论”来说明时间旅行是不可能的。paradox“悖论，自相矛盾的观点”；paradigm“范例”；paranoia“偏执狂”；paraphia是指神经病学里的“触觉倒错”。只有A符合句意，故为答案。