好的，以下是一个一年级减法故事，以及相应的绘画描述：
故事标题：《小猴摘桃》
故事内容：
小猴猴在森林里有一棵很大的桃树。每年夏天，桃子熟了，小猴猴就会爬上树去摘桃子。今年，桃树上挂满了又大又红的桃子，小猴猴开心极了。
有一天，小猴猴发现树上原本有20个桃子。但是，小猴猴吃掉了3个，又掉下来2个。现在，树上还剩下多少个桃子呢？
绘画描述：
画面背景：一片绿意盎然的森林，一棵枝繁叶茂的桃树，树上挂满了红彤彤的桃子。
小猴猴形象：一个可爱的小猴子，穿着简单的衣服，正站在桃树下，脸上露出开心的笑容。
桃子数量：画面中用小圆圈或桃子形状的图标来表示桃子的数量。一开始是20个桃子，然后分别用不同的方式表示吃掉的3个和掉下来的2个。
减法算式：在画面的一角，用简单的数字和减号来表示算式：20 - 3 - 2 = 15。
剩余桃子：树上剩下15个桃子，可以用不同的颜色或标记来突出这些桃子。
以下是一个简化的绘画示例：
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森林
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|—桃树—小猴猴—
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