下面是关于Pentium微处理器总线时序的描述，其中错误的是
A．Pentium微处理器的突发式读写总线周期每次可传送4个64位数据
B．完成一次非流水线读写总线周期至少需要2个时钟周期
C．完成一次突发式读写总线周期至少需要4个时钟周期
D．流水线读写总线周期具有较高的总线利用率
参考答案：C
解析： 该题考查考生对Pentium 微处理器总线时序的理解。Pentium 微处理器支持多种不同类型的总线周期，按数据传送方式，可分为单数据传送总线周期和突发式读写周期，Pentium 微处理器的一个突发式读写总线周期的5个时钟周期内传送4个64位数据，而不是4个时钟周期，所以选项C是错误的，其他三个选项都是正确的描述，所以应该选择C。
How do people pass on messages? When you write a letter or make a telephone call, your words _ 1___ a message. People communicate with words. Do you think you can communicate _2__ words? A smile __3_ your face shows you are happy and friendly. Tears in your eyes tell__4__ that you are sad. When you __5_ your hand in class, the teacher knows you want to say something __6___ ask questions. You shake your head, and people know you are saying no. You nod and people know you are saying ____ .7 Other things can also give some information. For example, a sign at the bus stop helps you to know which bus __8___. A sign on the wall of your school helps you to find the library. Signs on doors tell you __ 9___ to go in or out. __10___ you ever noticed that there are a lot of signs around you and that you receive messages __11__ them all the time? People can communicate __12___ many other ways. A (An) 13__ can use his drawings to tell about beautiful mountains, about the blue sea and many other things. Books __14___ to tell you about all wonderful things in the world and also about people and their ideas. Books, magazines, TV and radio and films all help us to communicate with other people. They all help us to know __15__ is going on in the world.
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