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编辑点评： 许多同学在GRE作文考试时反映说素材不够，这是源于大家平时看得少、积累的不够。GRE写作素材系列为大家搜集了GRE作文几个常考话题的素材，希望对同学们的备考有所帮助。 Critical thinking is a path to intellectual adventure. Though there are dozens of possible approaches, the process can be boiled down to concrete steps. This article offers some starting points for your journey. Be willing to say I don t know Some of the most profound thinkers of our time have practiced the art of critical thinking by using two magic phrases: I don t know and I m not sure yet. Those are words many people do not like to hear. We live in times when people are criticized for changing their minds. Our society rewards quick answers and quotable sound bites. We re under considerable pressure to utter the truth in 15 seconds or less. In such a society, it is a courageous and unusual act to pause, to look, to examine, to be thoughtful, to consider many points of view and to not know. When a society embraces half-truths in a blind rush for certainty, commitment to uncertainty can move us forward. This willingness to give up certainty can be hardest to accept when it comes to notions that seem obvious. Many things are certain, some people say. For example, it s obvious that two plus two equals four. | 
