1.掷铜板之前要想题目，想好之后开始掷。

2.准备一个铜板，5元、10元、20元都可以，当你掷出人头就是”正”，反面是字的话就是”反”，掷两次，然后照顺序开始排，例如正反、反正…-1. Before you toss a coin in order to subject, like a good start after the throw.

2. Prepare a penny, 5 yuan, 10 yuan, 20 yuan can be, when you throw the head is the　positive , the opposite is the case is that the word　anti , throwing twice, then ranked according to the order of the start, such as positive and negative, anyway ... etc.