单项选择题

There are many ways to learn about people of other lands.One way is to study the clothing other people wear
For thousands of years,people in different parts of the world have worn very different types of clothing.There are four big reasons for this．
One reason might be religion.In many Moslem countries,women must wear veils to hide their faces.The veil must be worn in public.Veils are part ofthe Moslem religion．
The second reason is that different materials are used in different countries.For instance,in France the materials used in clothing may be cotton(棉),silk,wool,or many other man-madematerials.Most people in China wear cotton．
The way clothes are made are also very different.This is another reason why people dress differently.Western countries rely on machines to make most of their clothing.Someone living in India can use only hand power to make the clothing he needs．
World-wide differences in customs also lead to differences in clothing.A Mexican farmer wears a straw hat with a brim up.In China,a farmer wears a straw hat with a brim down.Bothhats are used to protect the farmers from the sun.Some of these customs have come down through thousands of years.
The two examples of wearing hats are given in the last paragraph to show______．