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【单选题】
设学生关系模式为：学生（学号，姓名，年龄，性别，成绩，专业），则该关系模式的主键是（ ）A.
姓名
B.
学号，姓名
C.
学号
D.
学号，姓名，年龄
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举一反三
【单选题】. He was late for the meeting because the bus he took ______ halfway.
A.
broke in
B.
broke down
C.
broke out
D.
broke up
【单选题】He was expecting to have completed the job by now . , he’s only halfway through it .
A.
As it is
B.
Even though
C.
That is
D.
In that case
【简答题】This movie was boring enough. He fell asleep halfway. (合并为一句) This movie was________ boring ________ he fell asleep halfway.
【多选题】一位同事问您，在为网络上的主机分配TCP/IP地址时，最重要的因素是什么他对影响子网掩码的因素特点感兴趣那么，在定义子网掩码时，应该考虑的最重要的因素是下列哪一些（）
A.
网络中默认网关的数目
B.
每个网段中主机的数目
C.
域控制器所使用的操作系统
D.
网络的数目
【简答题】—Did he say anything that appealed ________ you especially? —Not really. Actually I slept halfway through his speech.
【简答题】He was about halfway through his meal a familiar voice came to his ears. A.why B.where C.when D.while
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