阅读古诗，回答相关问题。
                                                                                                                                             木芙蓉
                                                                                                                                        南宋•吕本中
                                                                                                                    小池南畔木芙蓉，雨后霜前着意红。
                                                                                                                     犹胜无言旧桃李，一生开落任东风。

阿拉伯人和印第安人分别属于（    ）

写出上述三个实验中发生反应的文字表达式____、____、____．

“中国人的头，阿拉伯人的口，法兰克人的手”。据此，你认为在东西方文化交流中充当使者的是（   ）