【答案与解析】本文告诉我们，自1932年后，每届冬季奥林匹克运动会举行时，东道国与非东道国都可以为此发行纪念邮票。
1. A。 细节题。从第1句 The Winter Olympics(奥林匹克运动会) is also called the White Olympics 可知答案为 Ａ。
2. B。 细节题。根据句子 The first stamps marking the opening came out on January 25, 1932 in the United States for the 3rd White Olympics. From then on, publishing stamps during the White Olympics became a rule(规定)可知答案为 Ｂ。
3. C。细节题。根据文章内容在1932年举行第3届冬季奥林匹克运动会，在1936年举行第4届冬季奥林匹克运动会，由此推知每四年举行一次。
4. C。细节题。从句子 When the White Olympics came, the host countries(东道国) as well as the non-host countries published stamps to mark those Games中可知。
