给出一个电影评级表,列为MovieID,UserID和评级,写一个SQL查询,查找每个电影的平均评级,然后以平均评级的下降顺序返回结果.
Here is the SQL query that finds the average rating for each movie and returns the results in descending order of average rating:

```
SELECT MovieID, AVG(Rating) AS AverageRating
FROM movie_ratings_table
GROUP BY MovieID
ORDER BY AverageRating DESC;
```

This query uses the AVG aggregate function to calculate the average rating for each movie and returns the results in descending order of the average rating using the ORDER BY clause. The GROUP BY clause ensures that the average rating is calculated for each movie separately.