《项链》

特别提醒：在讨论交流过程中，立刻纪录下同学发言的亮点。
1、                                                                                                                             
2、                                                                                                                             
3、                                                                                                                             
二、为什么玛蒂尔德没有发现项链是假的？
我的解释：