阅读理解。 April F'ool's Day is on the first day of April. The sport of the holiday is to play silly but harmless jokes on family members, co-workers, and  friends. A victim（受害者）of one of these pranks（恶作剧） is called an April fool.  If one succeeds in tricking someone, one laughs and says 'April Fool', and then the person who has been tricked usually laughs, too. This holiday originated（起源）in France. When the French first adopted（采用）the Gregorian calendar（日历）in 1564, some people continued to use the old calendar to celebrate New Year's Day on April lst. These people were called April Fools. The custom of playing tricks on this day became popular in France and then spread to many other countries. Here are some typical pranks: Telling somebody to call the zoo and speak to Mr Fox. Putting salt in the sugar bowl. Setting the clock back an hour. Saying to friends, 'Oh, my God! You have four holes in your coat-button holes!' Tying a string to a wallet and leaving the wallet in the middle of the side walk. When someone stops to pick it up, the pranker yanks（猛拉）it out of reach.  In the United States today, April Fool's jokes are mostly played by children, who enjoy the holiday very much. 根据短文内容判断下列句子的正误，正确的用“A'表示，错误的用“B”表示。 (     )1.A victim of one of these pranks is called an April fool. (     )2. April Fool's Day originated in England. (     )3. April Fool's jokes are mostly played by children and old men. (     )4. Setting the clock back an hour is one of the typical pranks. (     )5. The custom of playing tricks on April lst spread to many other countries from France.