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# 遍历数组
## 说明
创建一个程序, 列出1到20之间的每第3个数字, 并将其打印到控制台。
> 提示: 使用for循环并修改迭代表达式
## 评分标准
| 标准 | 卓越表现 | 合格表现 | 需要改进 |
| -------- | --------------------------------------- | ------------------------ | ------------------------------ |
| | 程序运行正确且有注释 | 程序没有注释 | 程序不完整或存在错误 |
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