搜题请搜索小程序“爱下问搜题”
问题 选择题

某有机物X（C4H6O5）广泛存在于许多水果中，尤以苹果、葡萄、西瓜、山楂肉为多，经测试，该化合物具有如下性质：

①1mol X与足量的金属钠反应产生1.5mol H2 

②x与醇（ROH）或羧酸（RCOOH）在浓H2SO4和加热条件下均可反应生成有香味的产物

③X在一定条件下的分子内脱水产物（不是环状化合物）可和溴水发生加成反应。

根据上述信息，下列对X的结构的判断正确的是：

A．X分子中肯定有碳碳双键

B．X分子中可能有三个羟基和一个－COOR官能团

C．X分子中可能有三个羧基

D．X分子中可能有一个羟基和二个羧基

答案

答案：D

题目分析：1mol X与足量的金属钠反应产生1.5mol H2，这说明分子中存在3个羟基；x与醇（ROH）或羧酸（RCOOH）在浓H2SO4和加热条件下均可反应生成有香味的产物，乙醇分子中含有羟基和羧基。X在一定条件下的分子内脱水产物（不是环状化合物）可和溴水发生加成反应，这说明发生消去反应后生成烯烃。由于分子中含有4个碳原子、6个氢原子，所以该有机物的结构简式应该是HOOC－CHOHCH2－COOH，因此正确的答案选D。

点评：该题是中等难度的试题，也是高考中的常见题型。试题贴近高考，针对性强，注重解题的灵活性。该题的关键是熟悉常见官能团的结构和性质，然后结合题意灵活运用即可，有利于培养学生的逻辑推理能力和逆向思维能力。

完形填空

When I was 11, my grandfather began to teach me how to drive. I was a fast learner. At 16, I was already a   1  driver. However, when I passed into adulthood, I began to get speeding tickets. For me, this did not reflect one’s   2  as a driver. So I   3  to drive as fast as I could.

Then in September of 2005, I received a letter   4 my presence to discuss my future   ___5  rights. As I sat down, a man began to unfold my file. I was   6  to see my record was five pages long. The man gave me two   7 . I could turn in my   8  and not drive for three months or continue driving, but without tickets for one year. With two kids and a busy practice, I went with the second choice.

After the meeting, I had lunch with my friend, Nick. He noticed that my eating habits        ___9  my driving habits. Nick told me that my attention was   10  paid to the destination and not the process of getting there. The car gives fun, allowing me to get to my   __11  much faster. However, after reaching it, I was never truly satisfied because I   12_  the messages and lessons of the journey.

After the two  13 , I began to transform myself. I now enjoy driving, often taking the most scenic route. I have also slowed my   14  down, enjoying each bite as I go. Learning   15  is really a big lesson for me.

1. A. lucky         B. skilled         C. careless          D. poor

2. A. interest          B. belief            C. ability              D. character

3. A. stopped       B. wanted           C. began             D. continued

4. A. requesting        B. hoping           C. suggesting        D. planning

5. A. driving           B. swimming          C. diving               D. living

6. A. disappointed  B. depressed         C. surprised        D. terrified

7. A. tickets           B. choices           C. letters           D. pages

8. A. license           B. money            C. evidence          D. file

9. A. affected      B. matched           C. suited           D. caused

10. A. totally          B. partly            C. slowly           D. slightly

11. A. destination  B. process           C. place            D. journey

12. A. understood   B. lacked            C. gained           D. ignored

13. A. surveys      B. events            C. debates           D. arguments

14. A. working      B. driving           C. walking          D. eating

15. A. honesty      B. understanding     C. patience         D. carelessness
查看答案
单项选择题

（）组织结构是在总公司的领导下，按照产品或地区划分为多个事业部，总公司只保留预算、重要人事任免和重大问题的决策等权力，其他权力则尽量下放给事业部。

A、直线职能型

B、事业部制

C、矩阵制

D、多维立体制
查看答案