Conversation becomes weaker in a society that spends so much time listening and being talked to _______ it has all but lost the will and the skill to speak for itself.A as B which C that D what
题目
Conversation becomes weaker in a society that spends so much time listening and being talked to _______ it has all but lost the will and the skill to speak for itself.
A as B which C that D what
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第1题：
To develop the skill of listening, the teacher asks the students to learn several new words that will appear in the listening passage and predict what the listening is about. Which stage is it at in listening class now?A．Warming up.
B．Pre-listening.
C．While-listening.
D．Post-listening.答案：B解析：考查听前活动。在听文章之前，让学生学习可能在听力中出现的新单词并预测听力文章的内容。这是处于Dre-listening阶段。故选B。 -
第2题：
You should have put the milk into the ice box, I expect it ____undrinkable by now.A.became
B.had become
C.has become
D.becomes答案：C解析：本题考查时间状语从句
C选项，句意：你本该把牛奶放到冰里，我想现在这牛奶不能喝了。从句意分析，牛奶已经变质，不能喝了，属过去发生的动作对现在造成影响，再加上by now是现在完成时的典型时间状语，故选C项。
A选项，为一般过去时，与题意不符，故排除。
B选项，为过去完成时，故排除。
D选项，为一般现在时，与题干不符，故排除。
故正确答案为C 项。 -
第3题：
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（请作答此空） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.propagation
B.transmission
C.colliding
D.listening答案：A解析：尽管CSMA的效率远远大于ALOHA或时隙ALOHA，但它依然存在一个显著低效率的情况。当信道繁忙的时候，站点需要等待一段随机时间。当两个帧发生冲突时，在两个被破坏帧的传输持续时间内，信道仍然无法使用。使用随机时延会降低冲突的可能性。但如果帧的长度相对于传播时间来说很长，那么容量的浪费也是非常可观的。如果站点在传输时还继续监听信道，就能减少这种浪费。最大利用率与帧长和传播时间有关，帧越长或者传播时间越短，利用率就越高。 -
第4题：
To develop the skill of listening,the teacher asks students to learn several new words that will appear in the listening passage and predict what the listening material is about.Which stage is it at in listening class nowA.Warming up.
B.Pre-listening.
C.While-listening.
D.Post-listening.答案：B解析：考查听力教学。
在听文章之前，教师让学生学习可能在听力中出现的新单词并预测听文章的内容。这是处于听前(pre-listening)阶段。
故此题的正确选项为B。 -
第5题：
To develop the skill of listening, the teacher asks students to learn several new words that will appear in the listening passage and predict what the listening material is about. Which stage is it at in listening class now?A.Warming up.
B.Pre-listening.
C.While-listening.
D.Post-listening.答案：B解析：考查听力教学。
在听文章之前，教师让学生学习可能在听力中出现的新单词并预测听文章的内容。这是处于听前(pre-listening)阶段。
故此题的正确选项为B。 -
第6题：
TCP协议在建立连接的过程中会处于不同的状态，当状态为（ ）表示是被动关闭连接是形成。A.ESTABLISHED
B.TIME_WAIT
C.CLOSE_WAIT
D.LISTENING答案：C解析：TIME_WAIT：是主动关闭连接时形成的。主要是防止最后一个ACK丢失。由于TIME_WAIT?的时间会非常长，因此server端应尽量减少主动关闭连接。CLOSE_WAIT：是被动关闭连接是形成的。根据TCP状态机，服务器端收到客户端发送的FIN，则按照TCP实现发送ACK，因此进入CLOSE_WAIT状态。但如果服务器端不执行close()，就不能由CLOSE_WAIT迁移到LAST_ACK，则系统中会存在很多CLOSE_WAIT状态的连接。