题目内容
在下列不同结构的处理机上执行6x6的矩阵乘法C：A×B，计算所需要的最短时间。只计算乘法指令和加法指令的执行时间，不计算取操作数、数据传送和程序控制等指令的执行时间。加法部件和乘法部件的延迟时间都是3个时钟周期，另外，加法指令和乘法指令还要经过“取指令”和“指令译码”的时钟周期，每个时钟周期为20ns，C的初始值为“0”。各操作部件的输出端有直接数据通路连接到有关操作部件的输入端，在操作部件的输出端设置有足够容量的缓冲寄存器。如果处理机内只有一个通用操作部件，采用顺序方式执行指令，那么所需要的时间为(5)。如果单流水线标量处理机，有一条两个功能的静态流水线，流水线每个功能段的延迟时间均为一个时钟周期，加法操作和乘法操作各经过3个功能段，那么所需要的时间为(6)。
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SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文： Some kind of planning in composition writing is essential. For one thing it reveals whether you really have enough to say on the topic you have chosen while there is still time to change to another topic. It is also important because it stimulates your ideas and helps to fix them in your mind.
When you have chosen your topic, and perhaps have a general idea of your theme, make quick short notes of all the ideas that come into your head. Remember that these should be notes--words or phrases--not sentences, which would slow you down. As you do this you will find that new ideas will come to you, for one idea leads to another. You may have to rearrange your ideas, to decide which paragraphs they will fit into, and which ideas will be left out altogether. This should not take more than ten minutes, for in an examination you have no time to waste.
It is for you to decide how detailed you plan should be. If you are good at writing, and have had plenty of practice, probably only a few brief notes will be necessary, but if you are not, then you may require a more de tailed plan. But remember that even the best writers need to make some notes if they are going to produce a well-organized piece of writing.
A probable title to this passage might be ______.
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