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问题 单项选择题

磁盘存储器的等待时间是指( )。

A．磁盘旋转一周所需的时间

B．磁盘旋转半周所需的时间

C．磁盘旋转2/3周所需的时间

D．磁盘旋转1/3周所需的时间

答案

参考答案：B

开放性试题

      小亮刚从外地转入光明中学读书，他发现新学校里有很多新鲜事：

   （1）老师布置的课外作业形式多样，有一些作业还“怪怪的”，比如思想品德老师布置了一道课外作业，给妈妈洗一次脚。请你简要说说老师布置这种作业的理由。

                                                                                                                                                             

                                                                                                                                                             

   （2）期中考试到了，可小亮直到走进考场才知道他们的期中考试无人监考。咦？这样做又是为什么？

                                                                                                                                                             

                                                                                                                                                             

   （3）老师上课不再满堂灌，他让学生上网搜集资料，还把同学们分成不同的学习小组，课上小组交流、讨论、辩论。请你说说这样做有什么好处？ 

                                                                                                                                                              

                                                                                                                                                             

                                                                                                                                                             
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单项选择题

A new hotel（）in the center of town at the moment

A.has been built

B.is built

C.was built

D.is being built
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