题目内容

45 According to Dr Pagel, the academic performance of a student will be affected
A if he or she is not motivated.
B if he or she is troubled by disordered sleep.
C if he or she is a morning type.
D if he or she is a lazy person.

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39 Thrift shops can do everything EXCEPT
A give clothing a second life.
B generate in come for charities.
C provide cheaper clothes for the poor.
D stop rich people from wasting money

58 A put B keep C remove D study

I don’t think he could have done such a stupid thing last night, ________？
[A] do I
[B] could he
[C] has he
[D] did he

● 假设有学生 S（学号，姓名，性别，入学时间，联系方式），院系 D（院系号，院系名称，电话号码，负责人）和课程 C（课程号，课程名）三个实体，若一名学生属于一个院系，一个院系有多名学生；一名学生可以选择多门课程，一门课程可被多名学生选择，则图中（a）和（b）分别为（51）联系。假设一对多联系不转换为一个独立的关系模式，那么生成的关系模式（52）。