阅读短文，选择正确答案。

  Hello, I am Peter. Yesterday was Sunday. I walked to my grandpa's home. It was his birthday. I bought (要) many fruit and a big cake in the morning. My grandpa and grandma liked them very much. My mother cooked the lunch. We had a good time.

掷两枚骰子，用随机模拟方法估计出现点数之和为10的概率时，产生的整数随机数中每____个数字为一组．

汉武帝的叔叔梁王出行，千乘万骑，和天子一样威风。他还自造弓箭数十万，府库“珠玉宝器，多于京师”。对这种状况理解不正确的是(    )