输入一段英文文本,统计出现频率最高的前10个单词(除去of、a、the、and、be、to等无意义词语)。提示:在统计单词出现频率之前,需要先进行预处理解决文本中的大小写和标点符号的问题。 待处理文本如下: I have a dream today! I have a dream that one day every valley shall be exalted, and every hill and mountain shall be made low, the rough places will be made plain, and the crooked places will be made straight; "and the glory of the Lord shall be revealed and all flesh shall see it together." This is our hope, and this is the faith that I go ba