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58 A put B keep C remove D study

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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) 。

3 Practically all animals communicate either through sounds or through soundless codes.
A Certainly
B Probably
C Almost
D Absolutely

20 Oral problems can not be avoided in any way
A Right
B Wrong
C Not mentioned

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