题目内容
在某段时间，若对网络中某一资源的需求超过了该资源所能提供的可用部分，网络的性能就要变坏，这种情况就叫做拥塞(congestion)。TCP 进行拥塞控制的算法有四种，即慢开始(slow-start) 、拥塞避免(congestion avoidance)、快重传(fast retransmit)和快恢复(fast recovery)。
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Directions:In the boxes below are some of the words and phrases you have learned in this unit. Choose the one that best completes the sentences.1.Once we've ___________, you must come round for dinner.2.The prime minister succeeded in ___________ the challenge to his authority.3.After he qualified as a doctor, his mother __________ him _________ in a practice of his own.4.I'd like you to _____________ that manoeuvre again and then bring the car to a halt.5.Although horses do not generally mind the cold, ______________ from rain and wind is important.6.He's never done this type of work before; I'm not sure how he'll _______________ the other people.7.The police ___________ the suspect's fingerprints with those found at the crime scene.8.The methods of communication used during the war were _________ by today's standards.9.He gets ______________ when people don't understand what he's trying to say.10.Thousands of people blocked the street, _________ against the new legislation.11.After working her way around the world, she __________ teaching English as a foreign language.12.He said all he ____________ was that I'd change my mind at the last moment like Rose Spencer.13.She ___________ angrily at everyone and stormed out of the room.14.When she lost her job they could no longer ___________ their expensive lifestyle.15.Many software companies have ____________ popular programs to the new operating system.16.Those harmful things may be in the name of love, but it must be other things similar to ___________ desire.
Directions: In this part, there are 10 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE that best completes the sentence.1. The small town became a tourist attraction and its only restaurant became so crowded that the ______________ had to eat at home every night.
___________ you, but could you help me one more time with the copier?
Students will be evaluated by class performance as opposed to class __________.
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