问题 完形填空

完形填空(共10小题;每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从21—30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

The date was like any other day in his life. After school Michael walked past the   21   on the street corner. He stopped to look at the front row of shoes. And he felt   22    for himself. He really wanted to have them for his birthday.

  He  23   walked away and thought of what to tell his mother. He knew she would give  24    he liked if she could. But he also knew very well she had little money. He decided not to go home immediately, as he looked worried,his mother would   25   it. So he went to the park where he sat on the grass. Then he saw a boy in a wheelchair. He noticed that the boy   26   the wheel with his hands. Michael looked at him carefully and was   27   to see that the boy had no feet. He   28   his own feet. “It is much better to be without  29   than without feet.” He thought. There was no reason for him to feel so sorry and sad. He went away and  30  , thinking he was much luckier in life.

21. A. shop                                   B. factory                                      C. park                                 D. house

22. A. curious                              B. sorry                                C. eager                               D. glad

23. A. sadly                                  B. rapidly                             C. happily                            D. proudly

24. A. something                        B. everything                     C. nothing                           D. anything

25. A. notice                                B. find                                   C. feel                                  D. hate

26. A. drove                                 B. moved                             C. pulled                              D. carried

27. A. frightened                        B. excited                                C. surprised                      D. delighted

28. A. looked out                        B. held out                          C. put down                       D. looked down

29. A. birthday                                      B. shoes                               C. money                             D. wheelchair

30. A. smiled                                B. cried                                C. regretted                       D. explained

答案

21-25  ABADA       26-30  BCDBA  

填空题

醇与氢卤酸反应是制备卤代烃的重要方法。实验室制备溴乙烷和1-溴丁烷的反应如下: ① NaBr+H2SO4 = HBr+NaHSO4;②R-OH+HBrR-Br+H2O

可能存在的副反应有:醇在浓硫酸的存在下脱水生成烯和醚,Br-被浓硫酸氧化为Br2等。有关数据列表如下

 乙醇溴乙烷正丁醇1-溴丁烷
密度/g·cm-30.78931.46040.80981.2758
沸点/℃78.538.4117.2101.6
请回答下列问题:

(1)溴代烃的水溶性       (填“大于”、“等于”或“小于”)相应的醇;其原因是                          。

(2)将1-溴丁烷粗产品置于分液漏斗中加水,振荡后静置,产物在        (填“上层”、“下层”或“不分层”)。

(3)制备操作中,加入的浓硫酸必须进行稀释,目的是            。(填字母)

a.减少副产物烯和醚的生成         b.减少Br2的生成

c.减少HBr的挥发                 d.水是反应的催化剂            

(4)欲除去溴代烷中的少量杂质Br2,下列物质中最适合的是           。(填字母)

a.NaI          b.NaOH         c.NaHSO3        d.KCl            

(5)在制备溴乙烷时,采用边反应边蒸出产物的方法,其有利于                          ;但在制备1-溴丁烷时却不能边反应边蒸出产物,其原因是                                

问答题