In the whole history of western thought, there is only one man of whom it can be said that all philosophy after him was differen

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问题    In the whole history of western thought, there is only one man of whom it can be said that all philosophy after him was different because of him. That man is Rene Descartes (1596-1650), the great French mathematician, physicist, physiologist, and philosopher who flourished during the first part of the seventeenth century. 【F1】The most influential of his many writings were Meditations, in which he posed the fundamental question that was to haunt all subsequent thinkers to this very day. Like all profound questions, it is deceptively simple in appearance: Is there anything of which I can be certain?
   To be sure, philosophers had before Descartes asked, What can we know? They had even asked, What can we know with certainty? But Descartes asked, What can I know with certainty? And therein lies a revolution in thought. All of us proceed from day to day accepting all manner of propositions which we could not prove if challenged. I believe that the earth is a sphere, that matter is composed of atoms, etc. 【F2】I don’t imagine I could do a very good job of proving all these beliefs to someone who really doubted them, but I take it for granted that someone could—a physicist or biologist or geographer. 【F3】Suppose now, just as an exercise, that I put a little "doubtful" tag on every one of my beliefs which I can’t absolutely prove with perfect certainty. Suppose, in other words, that I clear away the superstructure of my everyday beliefs and get down to real base. What do I find? What do all these beliefs rest on? This is what Descartes sets out to do in the First Meditation. It doesn’t seem a terribly risky or exciting task, but as we follow Descartes, we begin to get more and more nervous. 【F4】Slowly at first and then faster and faster, he shows us that every one of our comfortable, familiar beliefs has to be put in the "doubtful" pile. As we dig for base, we find only shifting sand. Our whole world of beliefs seems to rest on nothing at all.
   In the Second Meditation, Descartes discovers his solid base, his immovable point:"I think." Doubt what you will, you cannot doubt that. And so long as I think, I who think must exist. Here at last we have found our certainty. 【F5】The absolute ground of all knowledge has been located, not in God, not in Nature, not in the wisdom of the ancients, but in the sheer existence of myself.
【F2】

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答案如果有人质疑这些观点,我不认为自己可以很好地证实它们,但我相信自然有人可以做到,如某个物理学家或生物学家或地理学家。

解析 ①本句是并列复合句,由but连接两个分句。②分句1中包括一个宾语从句和一个定语从句,imagine后接宾语从句,省略了引导词that。宾语从句中还包含了who引导的定语从句,修饰someone,指质疑这些信念的人。③分句2中包含另一个宾语从句,take it for granted that…中的it作形式宾语,真正的宾语是that从句的内容。
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