2012年2月美国白人协警齐默尔曼枪杀黑人马丁，未被追究任何责任，佛罗里达州法院在美国民众抗议浪潮中重启此案。在经过长达一年多的审理后，认定齐默尔曼无罪。全美各地再次引发强烈反响和抗议活动，美国总统奥巴马表态：“要是我有一个儿子，一定长得像马丁。”以此来安抚民众情绪。这表明在美国（     ）

根据以上实验事实判断：

阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。

    One cold evening in winter, I asked my dear mother, “Mum, what were you like when you were at my age?” She looked up, 1at my question.

    After a long time, she answered, “Polly, why did you ask me that? Well, you see, I was not so lucky as you. In our times, there was only one 2for girls－being a hard-working woman. To tell you the truth, I 3 my mother, your grandmother, when I was growing up. I did so much for her, but not once did she ever said, 'thank you'.”

    And then, Mother went on, “I had always wanted to hear a word of 4 from her, but I got only the family rules and wishes I could never manage. During those years, she 5 me to get up at six every morning and cook breakfast. She often 6 me with other girls, who were as 7 as me, and found my mistakes.”

     “Nothing was ever 8 enough for my mother,” continued my mother, “but now I know she did 9 me, even if she never said so. Polly, like your grandmother, I love all my children, and you are everything to me. I have been very strict and hard on you, but I am raising you in the only 10 I knew.”