阅读理解。 Boxing Day When is it? December 26th. Boxing Day takes place on December 26th or the following Monday if December 26th falls on a Saturday or Sunday. Where did it come from? Boxing Day began in England, in the middle of the nineteenth century. Where is Boxing Day celebrated? Boxing Day is celebrated in Australia, Britain, New Zealand,and Canada. How is Boxing Day celebrated? There seems to be two thoughts on the beginning of Boxing Day and why it is celebrated. One of them is that centuries ago, on the day after Christmas, bosses would give boxes full of food and fruit, clothing,or money to their servants (仆人). The presents were much like the bonuses(奖金) people receive today. These presents, given in boxes,gave the holiday its name,' Boxing Day'. Today, Boxing Day is spent with family and friends with lots of food and share of friendship and love. Government buildings and small businesses are closed but the  malls ( 购物商场) are open and filled with people exchanging presents or buying cheaper Christmas presents,cards and so on. 1. If December 26th is a Saturday,when Boxing Day will be celebrated? A. On December 25th. B. On December 26th. C. On December 27th. D. On December 28th. 2. How many countries does the passage mention celebrate Boxing Day? A. Only one. B. Two. C. Three. D. Four. 3. What does the underlined word' them' refer to? A. The boxes full of things. B. The countries which celebrate Boxing Day. C. Two thoughts on the beginning of Boxing Day and why it is celebrated. D. The presents that bosses gave their servants. 4. People have a day off on Boxing Day except those who work in _____. A. government buildings B. small companies C. malls D. post offices