List all the average reviews of Chinese restaurants for each county from highest to lowest.
Chinese restaurant refers to food_type = 'chinese'; average review refers to divide(sum(review), count(review))
SELECT AVG(T1.review) FROM generalinfo AS T1 INNER JOIN geographic AS T2 ON T1.city = T2.city WHERE T1.food_type = 'chinese' GROUP BY T1.id_restaurant ORDER BY AVG(T1.review) DESC