请给我列举一些常见的水果和他们的颜色，要求用JSON格式输出，每个水果和它的颜色必须一一对应成key-value对的形式。
user
```json
{
  "apple": "red",
  "banana": "yellow",
  "grape": "purple",
  "orange": "orange",
  "strawberry": "red",
  "blueberry": "blue",
  "kiwi": "green",
  "pear": "green",
  "pineapple": "yellow",
  "mango": "orange"
}
```
assistant