方案一：单笔消费每满200元立减50元，可累计；

方案二：单笔消费满200元可参与一次抽奖活动，抽奖规则如下：从装有4个小球（其中2个红球2个白球，它们除颜色外完全相同）的盒子中随机摸出2个小球，若摸到2个红球则按原价的5折付款，若摸到1个红球则按原价的7折付款，若未摸到红球按原价的9折付款。

单笔消费不低于200元的顾客可从中任选一种优惠方案。

（I）某顾客购买一件300元的商品，若他选择优惠方案二，求该顾客最好终支付金额不超过250元的概率。

（II）若某顾客的购物金额为210元，请用所学概率知识分析他选择哪一种优惠方案更划算？

18世纪，启蒙运动人才辈出，影响巨大。提出“人民主权说”、“社会契约论”的启蒙思想家是（    ）

    Mr. Black was over fifty years old. He sometimes made some mistakes in his work, and he lost his work. So he had1time every day to do something. Then he often met his old friends under a big tree. They had drinks there and2anything they liked.

    One day, some old men were sitting together again and talking about young people in this world. They all agreed that the old people were3than young people. Then one of the old4said that young men were stronger than old men.

    5of them agreed that this was true,6Mr. Black didn't. He said, “No. I am as strong now as when I was a young man.” His friends were surprised7what he said.

    “Well,” said Mr. Black, “Near my house there is a big stone. When I was a young man, I used8to move it, but I couldn't because I was not9. I am an old man now, and when I try to move it, I still10. So, I am as strong as when I was young.”