钱是什么
What Money Is
钱是什么、为什么使用钱；钱用来交换商品和服务；从以物易物到硬币再到电子支付的简要历史。
What money is and why we use it; that money is exchanged for goods and services; brief history from barter to coins to digital payments
学习证据 / Evidence
- 能解释人们用钱来购买他们需要或想要的东西
- 能举例说明在钱出现之前交易是如何进行的（以物易物或物物交换）
- 能说出至少两种钱的形式（硬币、纸币、银行卡、手机支付）
- Explain that people use money to pay for things they need or want
- Give an example of how buying worked before money existed (swapping or bartering)
- Name at least two forms money can take (coins, notes, card, phone payment)
评估问题 / Assessment
如果问{{name}}为什么人们用钱而不是直接交换东西，{{name}}能给出合理的回答吗？
If you asked {{name}} why people use money instead of just swapping things, could they give you a sensible answer?