[導讀]全國公共英語等級考試二級閱讀文章精選段落一
    If it were possible, however, it would present some pretty knotty paradoxes…… For example, what if someone or something traveled back in time and changed the ensuing future? And have you heard the one about the time traveler who dots back and forward in time and by means of various medical technologies is able to be his own father AND mother?! And besides, if time travel is possible, where are all the people from the future——surely they'd want to come and meet us poor stranded 21st century beings?
    然而，如果這一切成為可能的話，那么將會出現(xiàn)一些非常令人困惑的邏輯混亂……比如，如果某人或某物逆時間旅行并改變隨之發(fā)生的情況，那會發(fā)生什么情況呢?又比如說，你是否曾聽說過這樣的事情——一位時間旅行者在時間隧道中穿梭往返，利用各種醫(yī)學技術使自己成為自己的父親和母親?還有，如果時間旅行成為可能，未來的所有人都會在哪里呢?他們肯定想來見見我們這些滯留在21世紀的可憐人。