某中学历史研究性学习小组选题《中国封建王朝落日辉煌的实践》，请问以下哪位人物可以作为研究对象(   )

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

To the woman and child who sat at table 9,

    My name is Tony Posnanski. I am the manager of the restaurant ____ you ate a few weeks ago. The guests at a table close to yours asked to talk to me ____(obvious), they were angry. They said your child was so loud ____they couldn't enjoy their meal.

    When I got to your table, you looked at me and asked, “Do you know ____it is like to have a child with autism(自闭症)?” You were not rude when you asked the question. On ____contrary, you were quite polite.

    I know what I was supposed ____(say) when I went to your table, but I just wished you a happy meal and promised that your meal tonight was on me. Although I didn't know ____to answer your question, as a father of a 5-year-old boy, I do know the feeling of ____(be) a parent.

    I wrote this to you and your beautiful daughter because I wanted to thank you both. You have taught me a ____(value) lesson and given me a great restaurant memory. Nothing can prevent me ____doing the right thing. Sometimes doing the right thing does not make everyone happy; just the people who need it the most.

                                                    Sincerely

                                                    Tony Posnanski

①将单层玻璃固定在有一定倾斜的面上，把玻璃球靠在玻璃板的右侧，把橡胶球悬挂在支架上靠在玻璃板的左侧（如下图）

②随意拉开橡胶球，让其敲击玻璃板，玻璃球被弹开，记上玻璃球被弹出的距离。共做10次。

③换成双层玻璃板重做上述实验。