Classify each of the following items into at least three categor

Classify each of the following items into at least three categories and state your principle of classification.
a. Household appliances
b. Vacation destinations
c. Types of music
【正确答案】：a. Household appliances can be classified based on function (cooking, cleaning, cooling/heating), energy efficiency rating (low, medium, high), and size (small, medium, large).
b. Vacation destinations can be classified according to geography (beach, mountain, city), climate (tropical, temperate, arctic), and popularity (popular tourist spots, off-the-beaten-path destinations).
c. Types of music can be classified based on genre (rock, pop, jazz), tempo (fast or slow), and cultural origin (Western, Eastern, African).