5. The ends of modern centuries have been greeted with both apocalyptic anxieties and utopian fantasies. It is not surprising that both reactions have consistently proven to be misplaced. After all, the precise time when a century happens to end cannot have any special significance, since the Gregorian calendar, though widely used, is only one among many that people have devised.
Which one of the following, if true, could be substituted for the reason cited above while still preserving the force of the argument?
(A) It is logically impossible for both reactions to be correct at the same time.
(B) What is a utopian fantasy to one group of people may well be, for another group of people, a realization of their worst fears.
(C) The number system based on the number ten, in the absence of which one hundred years would not have the appearance of being a significant period of time, is by no means the only one that people have created.
(D) The firm expectation that something extraordinary is about to happen can make people behave in a manner that makes it less likely that something extraordinary will happen.（C）
(E) Since a century far exceeds the normal human life span, people do not live long enough to learn from mistakes that they themselves made one hundred years before.
这题稀里糊涂的选对了，又改错了，想请教一下这题是怎么选出（C）的呢？谢谢了先：）人们不必对每个世纪的终结大惊小怪。 不就是过了100年嘛. Gregorian calendar (阳历)只不过是我们发明的众多的历法的一种。（没了Gregorian calendar，人们不会把作为一个时间段的100年当会事。）
答案C: 十进制不是我们发明的唯一计数方法。没了十进制，100年根本就没什莫大不了的。
哦，知道了，原来是这样啊，谢谢了，明白啦：）
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