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问题 选择题

---How far is your home to your school?

---It _________ me about twenty minutes by bus.

A．costs

B．spends

C．pays

D．takes

答案

答案：D

spend和pay主语通常为人，故不选，take表示花费的意思，主语通常为形式主语it，故本题选D。

问答题

（1）今年，国庆节、中秋节和教师节三大节日相差不到几天。高二年级学生会成员想就此机会给祖国、家人和老师献上三副对联。请你从下面六副对联中选出最贴切的三副，把序号分别填写在横线上。

① 广施甘露千株翠，报得春风一寸丹

② 三月光阴槐火换，二分消息杏花知

③ 玉莹盘润长安乐，人寿年丰大吉祥

④ 盛世腾飞基昨日，神州崛起看今朝

⑤ 三径就荒菊绽蕊，一堂大喜燕来宾

⑥ 激情洋溢，写大千世界，世态炎凉。笔走龙蛇，绘自然奇观，气象万千

国庆节（献给祖国）：__________________

中秋节（献给家人）：__________________

教师节（献给老师）：__________________

（2）毛宗岗评价《三国演义》人物有三绝，其中“智绝”是诸葛亮，而“ * * 觉”是____________“义绝”是____________

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单项选择题

Let us now see how randomization is done when a collision occurs. After a ______, time is divided into discrete slots whose length is equal to the worst-case round-trip propagation time on the ether (2t). To accommodate the longest path allowed by Ethernet, the slot tome has been set t0 512 bit times, or 51.2μsec.

A.local B.nextC.higher D.lower

After the first collision, each station waits either 0 or 1 ______ times before trying again. If two stations collide and each one picks the same random number, they will collide again. After the second collision, each one picks either 0, 1, 2, or3 at random and waits that number of slot times. If a third collision occurs (the probability of this happening is 0.25), then the next time the number of slots to wait is chosen at ______ from the interval 0 to 23-1.
In general, after i collisions, a random number between 0 and 2i-1 is chosen, and that number of slots is skipped. However, after ten collisions have been reached, the randomization ______ is frozen at a maximum of 1023 slots. After 16 collisions, the controller throws in the towel and reports failure back to the computer. Further recovery is up to ______ layers.
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