问题 问答题 简答题

交换机开启环路检测的目的。

答案

参考答案:

是及时检测交换机的端口是否出现环路。若出现环路,关闭其中的几个端口,直到只剩下其中的一个端口正常工作,从而保护网内不受广播风暴的影响。

完形填空

Mr. Evans lives in a city. He was a         three years ago. He taught well and his students         him very much. So he decided to work in the middle school all his life. But a terrible accident        his fortune(命运).

One spring he took his class to         the Ming Tombs. The children saw a lot of         things and had a good time there. But on their way to school, their          was hit by a truck because the driver was drunk(喝醉的). Five students         and more than half of the children were badly         in the accident. He didn’t know how it happened and was very         it after he came out of hospital. He left the school and became a        . He tried his best to stop the drivers from breaking the traffic rules. He worked hard and was strict with the drivers. So they were afraid of him.

小题1:A. worker                 B. teacher                   C. doctor  

小题2:A. liked                   B. wished                   C. helped

小题3:A. beat                    B. won                     C. changed

小题4:A. build                   B. break                    C. visit

小题5:A. terrible                 B. interesting                 C. safe

小题6:A. bus                    B. car                       C. bike

小题7:A. left                    B. lived                     C. died

小题8:A. beat                   B. hurt                      C. stopped

小题9:A. sad about               B. afraid of                  C. interested in

小题10:A. solider                B. policeman                  C. cleaner

不定项选择