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无线局域网所使用的扩频的主要方法是______和直接序列扩频。

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Consider the following statements, made by the same man eight years apart. "Eventually, being ’poor’ won’t be as much a matter of living in a poor country as it will be a matter of having poor skills." That was Bill Gates talking in 1992. Way back then, the Microsoft chairman’s image was that of a rather harsh, libertarian-leaning fellow who proudly declared his products alone would "change the world." When asked what he would do with his billions, the boy wonder of Silicon Valley used to shrug off the question, saying his long workdays didn’t leave time for charity. But now listen to the same Gates-or perhaps not quite the same Gages-talking in the fall of 2000: Whenever the computer industry has a panel about the digital divide and I’m on the panel, I always think, "OK, you want to send computers to Africa, what about food and electricity-those computers aren’t going to be that valuable"... The mothers are going to walk right up to that computer and say: "My children are dying, what can you do" Yes, even Bill Gates, the iconic capitalist of our day, seems to have come around. The self-assured Gates of 1992 was obviously a man of his times, confident of his industry’s ability to change the world, certain that the power of markets and new technology, once unleashed, would address most of the world’s ills. But the more skeptical Gates of the new millennium is someone who evinces a passion for giving and government aid. He shares a growing realization, even in the multibillionaire set, that something is amiss with the ideology that has prevailed since the end of the cold war: global-capitalism-as-panacea. But the more skeptical Gates of the new millennium is someone who evinces a passion for giving and government aid.

Part A For Questions 1 ～ 5, you will hear a conversation. While you listen, fill out the table with the information you have heard. Some of the information has been given to you in the table. Write only 1 word in each numbered box. You will hear the recording twice. You now have 25 seconds to read the table below. It will be easier for the person who is suffering from flu to rest if he doesn’t eat ______.

第一节听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 What is important for them to do

A. Carry out instructions.
B. Experience.
C. Practice together.

网络并行计算根据其组建思想和实现方法可以分为机群计算和______等两大类。