阅读理解。 People all know that December 25th is Christmas for Americans and other westerners. Yet not all the people know Boxing Day. Boxing Day is a holiday observed on December 26,or the first weekday after Christmas. And it is a festival only for those service persons such as postmen, newspaper boys, milkmen, etc.  On that day, families traditionally give Christmas boxes to those service workers. It is a custom, but nobody is certain how it was originated. A popular legend tells the story. There was once a rich lady called Chatter in England. One morning many, many years ago, it snowed very heavily. Chatter was waiting anxiously for a very important letter from her boyfriend. Then a post boy came and gave her the letter. She was so pleased that she gave him a box with presents. Later on, more and more people followed her example. As time went by, giving boxes with presents to service persons became a custom in Great Britain. Later the custom spread to America. In the USA, some people give their employees money instead of boxes nowadays. 1. Boxing Day is observed _____. A. on December 25 B. on December 26 C. on the first weekday after Christmas D. either B or C 2.'The first weekday' refers to _____. A. Monday B. Sunday C. Saturday D. Friday 3. _____  on Boxing Day. A. Those service persons would box each other B. Service workers would give boxes from service workers C. The employers receive boxes from service workers D. Service workers receive boxes from the employers 4. According to the popular legend story, Boxing Day originated from _____. A. America B. Australia C. England D. Canada 5. On Boxing Day in the USA nowadays, _____. A. all the service workers receive money instead of boxes from their employers B. people give the service workers boxes only C. some people give money to the service workers, while others still give boxes D. people do not give boxes or money to the service workers