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[问题3] HFC是采用 (8) 制方式通过宽带同轴电缆向用户提供宽带业务。Cable Modem接收从CMTS发送来的 (9) 调制信号，经解调后重建以太帧。在相反方向上，接收到的以太帧被封装在时隙中，经 (10) 调制后，通过HFC网络的上行信道传送给CMTS。
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The world’s population continues to grow. There now are about 4 billion of us on the earth. That could reach 6 billion by the end of the century and 11 billion in another 75 years. Experts long have been concerned about such growth. Where will we find the food, water, jobs, houses, schools and health care for all these people A major new study shows that the situation may be changing. A large and rapid drop in the world’s birth rate has taken place during the past 10 years. Families generally are smaller now than they were a few years ago. It is happening in both developing and industrial nations. Researchers said they found a number of reasons for this. More men and women are waiting longer to get married and are using birth control devices and methods to prevent or delay pregnancy. More women are going to school or working at jobs away from their homes instead of having children. And more governments, especially in developing nations, now support family planning programs to reduce population growth. China is one of the nations that has made great progress in reducing its population growth. China has already cut its rate of population growth by about one half since 1970. China now urges each family to have no more than one child. And it hopes to reach zero population growth, the number of births equaling the number of deaths, by the year 2000. Several nations in Europe already have fewer births than deaths. Experts said that these nations could face a serious shortage of workers in the future. And the persons who are working could face much higher taxes to help support the growing number of retired people. Some time in the future, the people who are working in Europe would have to pay much higher taxes because ______.
The first and smallest unit that can be discussed in relation to language is the word. In speaking, the choice of words is (31) the utmost importance. Proper selection will eliminate one source of (32) breakdown in the communication cycle. Too often, careless use of words (33) a meeting of the minds of the speaker and listener. The words used by the speaker may (34) unfavorable reactions in the listener (35) interfere with his comprehension; hence, the transmission-reception system breaks down. (36) , inaccurate or indefinite words may make (37) difficult for the listener to understand the (38) which is being transmitted to him. The speaker who does not have specific words in his working vocabulary may be (39) to explain or describe in a (40) that can be understood by his listeners.
套汇指利用______的汇率差异，通过贱买贵卖某种外汇赚取利润的行为。
金融市场按其在再生产过程中的作用可分为______市场和资本市场。
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