试题与答案

下图中的每一方格表示相关的一种反应物或生成物。其中B 是一种单质,其余物质也都是

题型:推断题

题目:

下图中的每一方格表示相关的一种反应物或生成物。其中B 是一种单质,其余物质也都是含B元素的化合物。C是一种钠盐,E是C对应的酸,B的结构类似金刚石,D为B的氧化物(其他不含B元素的反应产物以及各步反应添加的必要试剂和反应条件已被略去),

请填写空白:

(1)A、D、E的化学式分别为_______、_________、_________。

(2)A和B的互相转化在工业上有什么实际意义___________?

(3)写出D→C反应的化学方程式:_______________。

(4)写出E→D反应的化学方程式:_______________。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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     One day Mr Jackson took Paul to his favorite restaurant. It was a French restaurant. The waiter was

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     The waiter gave them a menu each.  They studied them. " You can spend only twenty-five dollars,"

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     ''How much is the tomato soup?" Paul asked. "Six dollars," the waiter said. "It's very good.''"How

much is the duck with orange?" Paul asked next. "Fifteen dollars" the waiter said."How much is the

chocolate ice cream?"  "Six dollars," the waiter said.

     Paul added(加)it up quickly. Six plus fifteen plus six is twenty-seven. He thought he could have the

duck and the soup, or the duck and the ice cream.  "I'll have the duck and the chocolate ice cream,  

please," he said to the waiter.

     Paul said to his father,  "My meal will cost only twenty-one dollars. Can I keep the other four

dollars?" His father laughed, "No, Paul," he said. "Leave it for the waiter."

1. How did the waiter speak to Paul and Mr Jackson?

                                                                                        

2. What did Paul have for dinner?

                                                                                

3. How much did Paul's meal cost?

                                                                                

4. What did Mr Jackson tell Paul to do with the other $4?

                                                                                

5. What does this passage tell us?

                                                                                  

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