题目

写出下列化学方程式： （1）用氯酸钾和二氧化锰的混合物制氧气（2）硫在空气中燃烧 （3）红磷在空气中燃烧（4）铁丝在氧气中燃烧： ． 答案：【考点】书写化学方程式． 【专题】元素与化合物；化学用语和质量守恒定律． 【分析】首先根据反应原理找出反应物、生成物、反应条件，根据化学方程式的书写方法、步骤（写、配、注、等）进行书写即可． 【解答】解：（1）氯酸钾在二氧化锰的催化作用下生成氯化钾和氧气，反应的化学方程式阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳答案。 CI have tried to write a ghost story that won't make you unhappy with yourselves, with each other, with the seasons, or with me. I hope it haunts your houses pleasantly.Charles DickensOne Christmas Eve, old Scrooge and Bob were working busily in his office. It was a cold, foggy day. The fog was so thick that the houses opposite were like ghosts. It was only three o'clock in the afternoon, but it was already quite dark."Merry Christmas, Uncle! God bless you!" cried a happy voice. It was Scrooge's nephew."Bah!" said Scrooge "Humbug(骗人的话)!""Christmas is a humbug! Surely you don't mean that, Uncle." Said his nephew."I do," said Scrooge. "Merry Christmas! What reason have you got to be merry? You're poor.""OK, then," replied the nephew cheerfully. "What reason have you got to be sad? You are rich. Don't be angry, Uncle!" said his nephew."What else can I be?" answered the uncle, "I live in a world of fools! Merry Christmas! What's Christmas time to you? It's a time for paying bills without money, It's a time for finding yourself a year older, but not richer. Everyone who goes around saying "Merry Christmas" should have his tongue cut out. Yes, he should!""Uncle! Please don't say that!" said the nephew. "I've always thought of Christmas time as a good time, a kind, and a charitable, happy time. And so, Uncle, Christmas has never put any gold or silver in my pocket, but I think it has done me good. And it will do me good. And I say, God bless it!"Bob, standing in the corner of the room, applauded(鼓掌).He realized his mistake very soon, and went quickly bake to his work, but Scrooge had heard him."One more sound from you, Bob Cratchit," said Scrooge, "and you'll celebrate Christmas by losing your job!""Don't be angry with him, Uncle. Come and have dinner with us tomorrow.""No." said Scrooge."I'm sorry you don't want to celebrate Christmas. But I do. So a Merry Christmas, Uncle!""Good afternoon!" said Scrooge."And a Happy New Year!" said his nephew."Good afternoon!" said Scrooge again.His nephew left the room. He stopped to wish Bob a Merry Christmas. And Bob replied, "AMerry Christmas to you, too."（1）In which season did the story take place?A.Spring.B.Summer.C.Autumn.D.Winter.（2）What did Scrooge think of Christmas wish?A.It was simple .B.It was important.C.It was stupid.D.It was necessary.（3）What did Scrooge's nephew mean by saying " Christmas time is a charitable time"?A.Christmas was a time to be generous and kind.B.Christmas was a time to do some challenging work.C.His uncle should give some money to his family.D.His uncle should give away his money to the poor.（4）Which of the following is TRUE about Scrooge and Bob?A.Scrooge was Bob's uncle.B.Bob worked for Scrooge.C.Scrooge celebrated Christmas with Bob.D.Bob was Scrooge's visitor（5）What can we infer(推断)from the story?A.Scrooge was working busily in his office before Christmas.B.No rich people wanted to waste their time to celebrate Christmas.C.Bob believed in Christmas wish as well as Scrooge's nephew.D.Scrooge refused his nephew's invitation to dinner on Christmas day.