题目

下列除去杂质的方法正确的是（ ） A . 除去乙烷中少量的乙烯：通过酸性KMnO4溶液进行分离 B . 除去溴苯中少量的溴，可用苯进行洗涤、分液 C . 除去乙酸乙酯中少量的乙酸：用饱和碳酸钠溶液洗涤、分液，然后干燥、蒸馏 D . 除去氯气中少量的氯化氢，通过NaOH溶液进行分离 答案：CApril FoolEvery year, we celebrate many special days－Mother’s Day, Father’s Day, and New Year’s Day. In North America and parts of Europe, people celebrate April Fool’s Day.Many believe that the French started April Fool’s Day. Centuries ago, New Year’s Day in Europe was April 1. In 1582, the calendar changed and King Charles IX of France moved it to January 1. Some people did not like this and chose to keep April 1 as New Year’s Day. Many called these people “April fools” and played jokes (开玩笑) on them. Over time, April 1 became a day to have fun in France. It then became popular in England and Scotland, and later, to North America.On April Fool’s Day, playing jokes is popular. In the United States, for example, a person may move a friend’s clock one hour earlier, or change the sugar with salt. In Spain and Mexico, people play jokes on each other on December 28. In India, it happens on March 31. In many countries around the world, April 1 is a day of fun. There is a lot of fun, and many shouts of “April Fool!”1.Many people believe April Fool’s Day first started in .A.China B.England C.America D.France2.What is popular on April Fool’s Day?A.Playing jokes. B.Painting a friend’s clock.C.Buying sugar and salt. D.Celebrating New Year’s Day.3.In India, April Fool’s Day is on .A.January 1 B.March 31 C.April 1 D.December 28