第二节 完形填空(共20小题；每小题1．5分，满分30分)
阅读下面短文，掌握其大意，然后从36—55各题所给的A、B、C、D四个选项中，选出最佳选项。
Liberal education is becoming the task of teachers. It is
36 not only to teach and learn knowledge, but also develop a person' s character. Its
37 is to teach each student to think for himself and make
38 decisions. Now liberal education has a great effect on the world. Much work has been done to
39 a better way of teaching.
In a liberal
40 , students are encouraged to have their own thoughts and their own ideas
41 they have lessons which are often held in the form of
42 . They are properly guided to
43 the knowledge learned. Punishment
44 exists. Teachers and students are just like
45 The
46 is of course a perfect one if it can really be carried out. However, it
47 exists in the imagination and will never be realized. We must admit that children should at least be
48 properly. Just close your
49 and think how many students will
50 the duties of a student if they are not pushed. What is the
51 of advice only if it is not supported by a reasonable
52 of control and punishment?
It is
53 for us to judge the success and failure of the kind of education now, but
54 the behavior of the children, which is actually the
55 of liberal education, we can see that something must be done to help these children.
C. refused
C. reason
C. wild
C. find
C. classroom
C. when
C.outside activities
C. write
C. no longer
C. parents
C. case
C. even
C. considered
C. minds
C. perform
C. use
C. person
C. hard
C. about
C. result
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D. reported
D. cause
D. wide
D. teach
D. playground
D. where
D.group discussions
D. review
D. once more
D. partners
D. truth
D. never
D. punished
D. classes
D. return
D. kind
D. master
D. proper
D. from
D. purpose
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B. needed
B. aim
B. wise
B. make
B. school
B. before
B. practice
B. use
B. more or less
B. enemies
B. fact
B. only
B. guided
B. eyes
B. make
B. matter
B. request
B. possible
B. against
B. goal
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36. A. designed 37. A. result
38. A. quick
39. A. hold
40. A. class
41. A. after
42. A. playing
43. A. remember
44. A. for ever
45. A. strangers
46. A. idea
47. A. also
48. A. liked
49. A. doors
50. A. order
51. A. meaning
52. A. degree
53. A. easy
54. A. with
55. A. progress
②电解CuSO4溶液和NaCl混合溶液阴极的反应为：Cu2++2e- =Cu,阳极反应为：2Cl--2e-=Cl2↑，而气体一共是672 mL，为0.03mol，如果全部都是氯气，则氯离子需要0.06mol，但是题目中氯化钠为0.04mol，所氯离子不足，最多提供0.04mol氯离子，所以最多生成0.02mol的氯气，剩下的0.01mol的气体则是氧气的体积，当氯离子放电完后，氢氧根离子放电。要生成0.01mol氧气，根据电极反应式，则需要0.04mol的氢氧根离子，所以溶液中由水电离出的氢离子也是0.04mol，浓度为0.1mol/L，PH=1。