根据短文内容，选择正确答案。

Dear Ken,

      I'm glad to hear from you. You asked me how to do well in English exams. Sometimes your knowledge is enough, but you also need good strategies.

 Here are some advice for you:

      Before you answer the questions, if you feel a little nervous, take a few deep breaths to help you relax.

      Always read the question carefully and make sure that you understand it. Read it a few times if possible.

      Find out how much each question is worth or how many points you need.

      If it asks you to give one answer, only give one.

      If there is a difficult question, don't worry. Go on with the next question and come back to it if you have time later.

      Try not to leave questions unanswered when you finish the text. Sometimes a guess may help you get points.

      When you finish, go back and check your answers. You will need to check your writing or spelling mistakes.

     Best wishes to you and your family.

                                                                                                                                                                                Yours,

                                                                                                                                                                                   Amy

在“碳酸氢钠、干冰、碳酸钙、过磷酸钙、锰钢、酚醛塑料”中选择适当的物质填空：

（1）可用作磷肥的是____ ；      （2）属于有机合成材料的是____ ；

（3）用作自行车支架的是____ ； （4）可用作致冷剂的是____ ；

（5）可用作制糕点的是____ ；  （6）可用作补钙剂的是____ ．

下列各数中，负数是（      ）.

写作。

根据表格信息写一段短文，要求使用上比较级，不少于五句话。

《天朝田亩制度》中规定：“凡当收成时，两司马督伍长除足其25家每人所食可接新谷外，余则归国库，凡麦、豆、苎麻、布帛、鸡、犬各物及银钱亦然”。各家遇有婚丧嫁娶和生育等事，按规定费用到“国库”领取。鳏寡孤独残废等丧失劳动能力的人，也由“国库”开支抚养。这实质上表明太平天国