住宅小区里有小石子铺的路，如图所示，穿着软底鞋或光着脚走在上面可以健身，它的原理是：脚底对石子压力____ ，脚底与石子的接触面积____ 压强____ ，从而对脚底的刺激增强．（均选填“增大”、“不变”或“减小”）

阅读下列短文，根据短文内容，从短文后各题所给的A、B、C、 D四个选项中，选择最佳选项。

    Mom and dad are the most important people in your life. They have been looking after you since you were born, so you should always love them. You should also get on well with them. But some children don't know how to do this. Here are some ways to help you.

    Spend more time with your parents. Don't spend too much time playing computer games or watching TV. Ask your parents to play with you. Talk or go outside with them.

    Be kind to your parents. You can make them happy with a smile when you come home. You can send your mother a card on Mothers' Day or tell your father a joke on his birthday. You can also clean your room by yourself.

    Work hard.If you do your best in your studies, your parents will be proud of you.

阅读下列材料：
材料一 机器制造一事，为今日御侮之姿，自强之本。……洋机器与耕织、刷织……
——李鸿章《置办外国铁厂机器折》
材料二 窃闻东西各国之强，皆以立宪法开国会之故。国会者，君与民共议一国之政法也。
——康有为《请定立宪开国会折》
材料三 ……追本溯源，……只因为拥护德、赛两先生，闹了多少事，流了多少血，德、赛两先才渐渐从黑暗中把他们救出，引到光明世界。我们现在认定只有这两位先生可以救治中国政治上、道德上、学术上、思想上一切的黑暗。

——陈独秀

辜鸿铭曾在北京大学任教，他梳着辫子走进课堂，学生们觉得很怪异，都在发笑。辜平静地说：“你们笑我，无非是因为我的辫子。我的辫子是有形的，可以剪掉，然而诸位同学脑袋里的辫子就不是那么好剪呀！”闻听此言，学生一片默然。后来促成“同学脑袋里的辫子”逐步被“剪掉”的是（    ）

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