某班学生做完早操回到教室，忽然有人发出"哎哟"的叫声，老师发现

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问题单项选择题

某班学生做完早操回到教室，忽然有人发出"哎哟"的叫声，老师发现原来有人在班干部的凳子上反钉了几颗钉子。下列处理方式中，最恰当的一项是（）。

A.立即查找肇事者

B.让学生把钉子敲平，开始上课，课后处理

C.幽默带过，开始上课

D.让班干部自我反思

答案

参考答案：B

解析：对有些偶发且没有造成伤害的事件应暂时搁置，仍按原计划进行教学活动，课后再处理。

单项选择题

关系模式R中若没有非主属性，则

A．R属于2NF，但R不一定属于3NF

B．R属于3NF，但R不一定属于BCNF

C．R属于BCNF，但R不一定属于4NF

D．R属于4NF

阅读理解

The first stage	The second stage	The third stage
Time: October l5,2003 Spaceship: Shenzhou V Main events: Chinese spaceman Yang Liwei was sent up into space. He went around the earth l4 times in his one -day flight. China became the third country to succeed in manned space flight.	Time: October l2, 2005 Spaceship: Shenzhou? Main events: Chinese spacemen Fei Junlong and Nie Haisheng were both sent up into space. On October l7, the two Chinese space heroes safely returned to the earth	Future plans 1. China will make a manned moon landing at a proper time around 2017. 2. China plans to set up a permanent (永久的) space lab, and build its engineering system in the near future

A．Yang Liwei
B．Fei Junlong
C．Nie Haisheng
D．Zhai Zhigang

A．Only one．
B．Two．
C．Three．
D．We don't know