数的概念和特性
几个GRE最常用的概念：
偶数：能被2整除的整数；
奇数：不能被2整除的数；
质数：大于1的整数，除了1和它本身外，不能被其他正整数所整除的，称为质数。也叫素数；（学过数论的同学请注意，这里的质数概念不同于数论中的概念，GRE里的质数不包括负整数）
倒数：一个不为零的数为x,则它的倒数为1/x。
家乡的小河
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快乐的秋假
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二十年后的拖把
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“六一”儿童节
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快乐元宵节
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Travel Alone or with Friends 独自旅行或与朋友一起
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我的理想
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